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Data Formats and Their File Extensions
.#24    Printer data file for 24 pin matrix printer (LocoScript)
.#ib    Printer data file (LocoScript)
.#sc    Printer data file (LocoScript)
.#st    Standard mode printer definitions (LocoScript)
.$$$    Temporary file
.$00    Pipe file (DOS)
.$db    Temporary file (dBASE IV)
.$ed    Editor temporary file (MS C)
.$o1    Pipe file (DOS)
.$vm    Virtual manager temporary file (Windows 3.x)
.000    Compressed harddisk data (DoubleSpace)
.001    Fax (many)
.075    75x75 dpi display font (Ventura Publisher)
.085    85x85 dpi display font (Ventura Publisher)
.091    91x91 dpi display font (Ventura Publisher)
.096    96x96 dpi display font (Ventura Publisher)
.0b     Printer font with lineDraw extended character set (PageMaker)
.1      Roff/nroff/troff/groff source for manual page (cawf2.zip)
.15u    Printer font with PI font set (PageMaker)
.1st    Usually README.1ST text
.301    Fax (Super FAX 2000 - Fax-Mail 96))
.386    Intel 80386 processor driver (Windows 3.x)
.3ds    Graphics (3D Studio)
.3fx    Effect (CorelChart)
.3gr    Data file (Windows Video Grabber)
.3t4    Binary file converter to ASCII (Util3)
.4c$    Datafile (4Cast/2)
.4sw    4dos Swap File
.4th    Forth source code file (ForthCMP - LMI Forth)
7.669    Music (8 channels) (The 669 Composer)
.6cm    Music (6 Channel Module) (Triton FastTracker)
.8      A86 assembler source code file
.8cm    Music (8 Channel Module) (Triton FastTracker)
.8m     Printer font with Math 8 extended character set (PageMaker)
.8u     Printer font with Roman 8 extended character set (PageMaker)
.a      Ada source code file
.a      Library (unix)
.a11    Graphics AIIM image file
.ab6    Datafile (ABStat)
.ab8    Datafile (ABStat)
.abk    Automatic backup file (CorelDRAW)
.abs    Abstracts (info file)
.abs    Data file (Abscissa)
.aca    Project (Project Manager Workbench)
.acb    Graphics (ACMB)
.acc    Program (DR-DOS - ViewMax) (GEM / resident)
.act    Actor source code file
.act    Foxdoc Action Diagrams (FoxPro)
.act    Presentation (Action!)
.ad     Screen saver data (AfterDark)
.ada    Ada source code file
.adb    Ada Package Body
.adc    Bitmap graphics (16 colors) (Scanstudio)
.adi    Graphics (AutoCAD)
.adl    Mca adapter description library (QEMM)
.adn    Add-in (Lotus 1-2-3)
.ads    Ada Package Specification
.adt    Datafile for cardfile application (HP NewWave)
.adt    Fax (AdTech)
.adx    Document (Archetype Designer)
.af2    Flowchart (ABC FlowCharter 2.0)
.afi    Truevision bitmap graphics
.afl    Font file (for Allways) (Lotus 1-2-3)
.afm    Type 1 font metric ASCII data for font installer (ATM - many)
.afm    Datafile for cardfile application (HP NewWave)
.ai     Vector graphics (Adobe Illustrator)
.ain    Compressed file archive created by AIN
.aio    APL file transfer format file
.ais    Array of Intensity Samples graphics (Xerox)
.aix    Datafile for cardfile application (HP NewWave)
.all    Format file for working pages (Always)
.all    General printer information (WordPerfect for Win)
.all    Symbol and font files (Arts & Letters)
.alt    Menu file (WordPerfect Library)
.amf    Music (Advanced Module Format)
.amg    Compressed file archive created by AMGC
.amg    System image file (Actor)
.ani    Animation (Presidio - many)
.anm    Animation (Deluxe Paint Animator)
.ann    Help Annotations (Windows 3.x)
.ans    Ansi graphics (character animation)
.ans    Ascii text ANSI character set (NewWave Write)
.aos    Add-On Software (Nokia 9000)
.ap     Compressed Amiga file archive created by WHAP
.ap     Datafile (Datalex EntryPoint 90)
.apc    Printer driver (Lotus 1-2-3)
.apd    Printer driver (Lotus 1-2-3)
.apf    Printer driver (Lotus 1-2-3)
.api    Passed parameter file (1st Reader)
.api    Printer driver (Lotus 1-2-3)
.apl    APL work space format file
.app    Add-in application file (Symphony)
.app    Application object file (dBASE Application Generator)
.app    Executable application file (DR-DOS - NeXTstep - Atari)
.app    Generated application (FoxPro)
.apr    Employee performance review (Employee Appraiser)
.apx    Appexpert database file (Borland C++ 4.5)
.arc    Compressed file archive created by ARC (arc602.exe/pk361.exe)
.arc    Compressed file archive created by SQUASH (squash.arc)
.arf    Automatic Response File
.ari    Compressed file archive created by ARI
.arj    Compressed file archive created by ARJ (arj241.exe)
.ark    Arc file archive created by CP/M port of ARC file archiver
.ark    Compressed file archive created by QUARK
.arr    Arrangement (Atari Cubase)
.art    Graphics (scrapbook) (Art Import)
.art    Raster graphics (First Publisher)
.arx    Compressed file archive created by ARX
.asc    Ascii text file
.asc    Transport armor file (PGP)
.asd    Autosave file (Word for Windows)
.asd    Presentation (Astound)
.asd    Screen driver (Lotus 1-2-3)
.asf    Datafile (STATGRAPHICS)
.asf    Screen font (Lotus 1-2-3)
.ash    Assembly language header file (TASM 3.0)
.asi    Assembler include file (Turbo C - Borland C++)
.asm    Assembly source code file
.aso    Assembler object (object orientated) file (Turbo Assembler)
.asp    Aspect source code file (Procomm Plus)
.asp    Association of Shareware Professionals OMBUDSMN.ASP notice
.at2    Auto template (Aldus Persuasion 2.0)
.atm    Adobe Type Manager data/info
.au     Sound (audio) file (SUN Microsystems)
.aux    Auxillary references (TeX/LaTeX)
.aux    Auxiliary dictionary (ChiWriter)
.ava    Publication (Avagio)
.avi    Audio Video Interleaved animation file (Video for Windows)
.aw     Text file (HP AdvanceWrite)
.awk    Awk script/program
.awm    Movie (Animation Works)
.aws    Data (STATGRAPHICS)
.b      Batch list (APPLAUSE)
.b&w    Black and white graphics (atari - mac)
.b&w    Mono binary screen image (1st Reader)
.b1n    Both mono and color binary screen image (1st Reader)
.b30    Printer font (JLaser - Cordata) (Ventura Publisher)
.b8     Raw graphics (one byte per pixel) plane two (PicLab)
.b_w    Black and white graphics (atari - mac)
.bad    Bad file (Oracle)
.bak    Backup file
.bal    Music score (Ballade)
.bar    Horizontal bar menu object file (dBASE Application Generator)
.bas    Basic source code file
.bat    Batch file (DOS)
.bb     Database backup (Papyrus)
.bbl    Bibliographic reference (TeX/BibTeX)
.bbm    Brush (Deluxe Paint)
.bbs    Bulletin Board System announce or text info file
.bch    Batch process object file (dBASE Application Generator)
.bch    Datafile (Datalex EntryPoint 90)
.bco    Outline font description (Bitstream)
.bcp    Borland C++ makefile
.bcw    Environment settings (Borland C++ 4.5)
.bdf    Bitmap Distribution Format font file (X11)
.bdf    Datafile (Egret)
.bdr    Border (MS Publisher)
.bez    Outline font description (Bitstream)
.bf2    Bradford 2 font
.bfm    Font metrics (unix/Frame)
.bfx    Fax (BitFax)
.bga    Bitmap graphics
.bgi    Borland Graphics Interface device driver
.bib    Bibliography (ASCII)
.bib    Database - not compatible with TeX format (Papyrus)
.bib    Literature database (TeX/BibTeX)
.bif    Binary Image Format b&w graphics (Image Capture board)
.bin    Binary file
.bio    OS/2 BIOS
.bit    Bitmap X11
.bk     Faxbook (JetFax)
.bk!    Document backup (WordPerfect for Win)
.bk1    Timed backup file for document window 1 (WordPerfect for Win)
.bk2    Timed backup file for document window 2 (WordPerfect for Win)
.bk3    Timed backup file for document window 3 (WordPerfect for Win)
.bk4    Timed backup file for document window 4 (WordPerfect for Win)
.bk5    Timed backup file for document window 5 (WordPerfect for Win)
.bk6    Timed backup file for document window 6 (WordPerfect for Win)
.bk7    Timed backup file for document window 7 (WordPerfect for Win)
.bk8    Timed backup file for document window 8 (WordPerfect for Win)
.bk9    Timed backup file for document window 9 (WordPerfect for Win)
.bkp    Backup file (Write - TurboVidion DialogDesigner)
.bkw    Mirror image of font set (FontEdit)
.bld    Bloadable picture (BASIC)
.blk    Temporary file (WordPerfect for Win)
.bm     Bitmap graphics
.bmk    Help Bookmarks (Windows 3.x)
.bmp    Bitmap graphics (PC Paintbrush - many)
.bnk    Adlib instrument bank file
.boo    Compressed file ASCII archive created by BOO (msbooasm.arc)
.bpc    Chart (Business Plan Toolkit)
.bpt    Bitmap fills file (CorelDRAW)
.br     Script (Bridge)
.brd    Eagle Layout File
.brk    Fax (Brooktrout Fax-Mail)
.bsa    Compressed file archive created by BSARC

.bsc    Compressed Apple II file archive created by BINSCII
.bsc    Database (Source Browser)
.bsc    Pwbrmake object file (MS Fortran)
.btm    Batch To Memory batch file (4DOS)
.bug    Bugs and Problems
.bup    Backup file
.but    Button definitions (Buttons!)
.buy    Datafile format (movie)
.bv1    Overflow file below insert point in Doc 1 (WordPerfect for Win)
.bv2    Overflow file below insert point in Doc 2 (WordPerfect for Win)
.bv3    Overflow file below insert point in Doc 3 (WordPerfect for Win)
.bv4    Overflow file below insert point in Doc 4 (WordPerfect for Win)
.bv5    Overflow file below insert point in Doc 5 (WordPerfect for Win)
.bv6    Overflow file below insert point in Doc 6 (WordPerfect for Win)
.bv7    Overflow file below insert point in Doc 7 (WordPerfect for Win)
.bv8    Overflow file below insert point in Doc 8 (WordPerfect for Win)
.bv9    Overflow file below insert point in Doc 9 (WordPerfect for Win)
.bwb    Spreadsheet application (Visual Baler)
.bwr    Beware (buglist) (Kermit)
.c      C source code file
.c      Compressed unix file archive created by COMPACT
.c++    C++ source code file
.c--    Source code (Sphinx C--)
.c00    Print file (Ventura Publisher)
.c86    C source code file (Computer Innovation C86)
.ca     Initial cache data for root domain servers (Telnet)
.cab    Cabinet File (Microsoft installation archive)
.cad    Softdesk Drafix CAD File
.cac    dBASE IV executable when caching on/off (see cachedb.bat)
.cad    Document (Drafix Windows CAD)
.cal    Calendar file (Windows 3.x)
.cal    Spreatsheet (SuperCalc)
.can    Fax (Navigator Fax)
.cap    Caption (Ventura Publisher)
.cap    Session capture file (Telix)
.cas    Comma-delimited ASCII File
.cat    Catalog (dBASE IV)
.cbc    Fuzzy logic system (CubiCalc)
.cbl    Cobol source code file
.cbm    Compiled bitmap graphics (XLib)
.cbt    Computer Based Training (many)
.cc     C++ source code file
.ccb    Visual Basic Animated Button Configuration
.ccc    Bitmap graphics (native format) (Curtain Call)
.ccf    Communications configuration file (Symphony)
.cch    Chart (CorelChart)
.ccl    Communication Command Language file (Intalk)
.cco    Btx Graphics file (XBTX)
.cdb    Card database (CardScan)
.cdb    Main database (TCU Turbo C Utilities)
.cdf    Graphics (netcdf)
.cdk    Document (Atari Calamus)
.cdr    Vector graphics (CorelDRAW native format)
.cdt    Data (CorelDraw 4.0)
.cdx    Compound index (FoxPro)
.ce     Main.ce (The FarSide Computer Calendar)
.ceg    Bitmap graphics (Tempra Show - Edsun Continuous Edge Graphics)
.cel    Graphics (Autodesk Animator - Lumena)
.cf     Configuration file (imake)
.cfg    Configuration
.cfl    Chart (CorelFLOW)
.cfn    Font data (Atari Calamus)
.cfo    C Form Object internal format object file (TCU Turbo C Utilities)
.cfp    Fax (The Complete Fax Portable)
.cga    CGA display font (Ventura Publisher)
.cgi    Common Gateway Interface script
.cgm    Computer Graphics Metafile vector graphics (A&L - HG - many)
.ch     Header file (Clipper 5)
.ch3    Chart (Harvard Graphics 3.0)
.ch4    Presentation (Charisma 4.0)
.chd    Font descriptor (FontChameleon)
.chi    Document (ChiWriter)
.chk    Recovered data (ChkDsk)
.chk    Temporary file (WordPerfect for Win)
.chl    Configuration History Log
.chn    Data (Ethnograph 3)
.chp    Chapter file (Ventura Publisher)
.chr    Character set (Turbo C - Turbo Pascal)
.cht    Chart (Harvard Graphics 2.0 - SoftCraft Presenter)
.cht    Interface file for ChartMaster (dBASE)
.cif    Caltech Intermediate Format graphics
.cif    Chapter information (Ventura Publisher)
.cix    Database index (TCU Turbo C Utilities)
.ckb    Keyboard mapping (Borland C++ 4.5)
.cl     Common LISP source code file
.clp    Clip art graphics (Quattro Pro)
.clp    Clipboard file (Windows 3.x)
.clp    Compiler script file (clip list) (Clipper 5)
.clr    Color binary screen image (1st Reader)
.clr    Color definitions (Photostyler)
.cls    C++ class definition file
.cm     Data file (CraftMan)
.cmd    Batch file (OS/2)
.cmd    Command (dBASE - Waffle)
.cmd    External command menu (1st Reader)
.cmf    FM-music file (Creative Music File)
.cmk    Card (Card Shop Plus)
.cmm    Cmm script (batch) file (CEnvi)
.cmp    Header file for PostScript printer files (CorelDRAW)
.cmp    User dictionary (MS Word for DOS)
.cmp    Bitmap graphics (Lead CMP compression)
.cmv    Animation (CorelMove CorelDraw 4.0)
.cnc    CNC general program data
.cnf    Configuration (program - printer setup)
.cnv    Data conversion support file (Word for Windows)
.cnv    Temporary file (WordPerfect for Win)
.cob    Cobol source code file
.cod    Datafile (Forecast Plus - MS Multiplan - StatPac Gold)
.cod    Program compiled code (FORTRAN)
.cod    Template source file (dBASE Application Generator)
.cod    Videotext file
.col    Color palette (Autodesk Animator - many)
.col    Spreadsheet (MS Multiplan)
.com    Command (memory image of executable program) (DOS)
.con    Configuration file (Simdir)
.cpd    Script (Complaints Desk)
.cpf    Fax (The Complete Fax)
.cpi    Code Page Information file (DOS)
.cpi    Colorlab Processed Image bitmap graphics
.cpl    Control panel file (Windows 3.x)
.cpl    Presentation (Compel)
.cpp    C++ source code file
.cpp    Presentation (CA-Cricket Presents)
.cps    Backup of startup files by Central Point PC Tools autoexec.cps
.cps    coloured postscript files 
.cpt    Compressed Mac file archive created by COMPACT PRO (ext-pc.zip)
.cpt    Encrypted memo file (dBASE)
.cpt    Template (CA-Cricket Presents)
.cpz    Music text file (COMPOZ)
.crd    Cardfile (Windows 3.x - YourWay)
.crf    Cross-reference (MS MASM - Zortech C++)
.crp    Encrypted database (dBASE IV)
.crs    File Conversion Resource (WordPerfect 5.1)
.crt    Terminal settings information (Oracle)
.cru    Compressed file archive created by CRUSH
.csg    Graph (Statistica/w)
.csm    Precompiled headers (Borland C++ 4.5)
.csp    Pc Emcee Screen Image file (Computer Support Corporation)
.css    Datafile (CSS - Stats+)
.css    Datasheet (Statistica/w)
.csv    Comma Separated Values text file format (ASCII)
.csv    Adjusted EGA/VGA palette (CompuShow)
.ctc    Control file (PC Installer)
.ctf    Character code translation file (Symphony)
.ctl    Control file (dBASE IV - Aldus Setup)
.ctx    Course TeXt file (Microsoft online guides)
.ctx    Ciphertext file (Pretty Good Privacy RSA System)
.cuf    C Utilities Form definition (TCU Turbo C Utilities)
.cur    Cursor image file (Windows 3.x)
.cut    Bitmap graphics (Dr. Halo)
.cv4    Color file (CodeView)
.cvp    Cover page (WinFax)
.cvs    Graphics (Canvas)
.cvt    Backup file for CONVERTed database file (dBASE IV)
.cvw    Color file (CodeView)
.cxx    C++ source code file (Zortech C++)
.dat    Data file in special format or ASCII
.db     Configuration (dBASE IV - dBFast)
.db     Database (Paradox - Smartware)
.db$    Temperature debug info (Clarion Modula-2)
.db$    Temporary file (dBASE)
.db2    Database (dBASE II)
.db3    Database (dBASE III)
.dba    Datafile (DataEase)
.dbd    Business data (Business Insight)
.dbd    Debug info (Clarion Modula-2)
.dbf    Database file (dBASE III/IV - FoxPro - dBFast - DataBoss)
.dbg    Symbolic debugging information (MS C/C++)
.dbk    Database backup (dBASE IV)
.dbm    Datafile (DataEase)

.dbm    Menu template (DataBoss)
.dbo    Compiled program (dBASE IV)
.dbs    Database in SQL Windows format
.dbs    Datafile (PRODAS)
.dbs    Printer description file (Word - Works)
.dbt    Data Base Text (Clipper)
.dbt    Foxbase+ style memo (FoxPro)
.dbt    Memo file for database w/same name (dBASE IV - dBFast)
.dbw    Windows file (DataBoss)
.dca    Document Content Architecture text file (IBM DisplayWrite)
.dcf    Disk image file
.dcp    Data CodePage (OS/2)
.dcs    Bitmap graphics (CYMK format) (QuarkXPress)
.dcs    Datafile (ACT! Activity Files)
.dct    Database dictionary (Clarion Database Developer)
.dct    Spell checking dictionary (Harvard Graphics 3.0 - Symphony)
.dcx    Bitmap graphics (Multipage PCX)
.dd     Compressed Macintosh file archive created by DISKDOUBLER
.ddb    Bitmap graphics
.ddi    Diskdupe Image file (ddupe322.zip)
.ddp    Device Driver Profile file (OS/2)
.deb    Debug script (DOS Debug)
.def    Assembly header file (Geoworks)
.def    Defaults - definitions
.dem    Demonstration
.dem    Graphics (VistaPro)
.dev    Device driver
.dfd    Data Flow Diagram graphic (Prosa)
.dfi    Outline font description (Digifont)
.dfl    Default program settings (Signature)
.dfm    Data Flow Diagram model file (Prosa)
.dfs    Delight Sound File
.dfv    Printing form (Word)
.dgn    Graphics (MicroStation)
.dgs    Diagnostics
.dh     Dependency information for .ph (Geoworks)
.dhp    Dr. Halo PIC Format graphics (Dr. Halo II - III)
.dht    Datafile (Gauss)
.dia    Diagraph graphics (Computer Support Corporation)
.dib    Bitmap graphics (Device-Independent Bitmap)
.dic    Lotus Notes / Domino dictonary file
.dif    Database (VisiCalc)
.dif    Output from Diff command - script for Patch command
.dif    Text file (Data Interchange Format)
.dip    Graphics
.dir    Dialing directory file (Procomm Plus)
.dir    Directory file (VAX)
.dir    Movie (MacroMind Director 4.x)
.dis    Distribution file (VAX Mail)
.dis    Thesaurus (CorelDraw)
.diz    Description file (Description In Zip)
.dkb    Raytraced graphics (DKBTrace)
.dl     Animation (Italian origin)
.dld    Data (Lotus 1-2-3)
.dlg    Dialog resource script file (MS Windows SDK)
.dll    Dynamic Link Library (Windows 3.x - OS/2)
.dll    Export/import filter (CorelDRAW)
.dls    Setup (Norton Disklock)
.dmo    Demo (Derive)
.dmp    Dump file (eg. screen or memory)
.dms    Compressed Amiga file archive created by DISKMASHER
.doc    Document text file
.dog    Screen file (Laughing Dog Screen Maker)
.doh    Dependency information for .poh (Geoworks)
.dos    External command file (1st Reader)
.dos    Network driver (eg. pkt_dis.dos)
.dos    Text file containing DOS specific info
.dot    Line-type definition file (CorelDRAW)
.dot    Template (Word for Windows)
.dox    Text file (MultiMate 4.0)
.doz    Description Out of Zip (VENDINFO)
.dp     Calendar file (Daily Planner)
.dp     Data file (DataPhile)
.dpr    Default project- and state-related information (Borland C++)
.drs    Display Resource (WordPerfect for Win)
.drv    Device driver eg. for printer
.drw    Vector graphics (Micrografx Designer)
.ds4    Vector graphics (Micrografx Designer 4.0)
.dsc    Discard file (Oracle)
.dsd    Database (DataShaper)
.dsk    Project desktop file (Borland C++ - Turbo Pascal)
.dsm    Digital sound module (DSI)
.dsn    Design (Object System Designer)
.dsp    Display parameters (Signature)
.dsp    Graphics display driver (Dr.Halo)
.dsr    Driver Resource (WordPerfect for Win)
.dss    Screensaver file (DCC)
.dss    Sound (Digital Soup)
.dsw    Desktop settings (Borland C++ 4.5)
.dt_    Data fork of a Macintosh file (Mac-ette)
.dta    Data file (Turbo Pascal - PC-File - Stata)
.dtf    Database file (PFS - Q&A)
.dtp    Document (Timeworks Publisher3)
.dtp    Publication (Publish-It!)
.dvc    Data (Lotus 1-2-3)
.dvi    Device Independent document (TeX)
.dvp    Desqview Program Information file (DESQview)
.dvp    Device parameter file (AutoCAD)
.dw2    Drawing (DesignCAD for windows)
.dwc    Compressed file archive created by DWC (dwc-a501.exe)
.dwg    Drawing (Drafix)
.dwg    Drawing database (AutoCAD)
.dx     Text file (DEC WPS/DX format - DEC WPS Plus)
.dxf    Drawing Interchange File Format vector graphics (AutoCAD)
.dxn    Fax (Fujitsu dexNET)
.dyn    Data (Lotus 1-2-3)
.ebj    Error-checking object file (Geoworks)
.edt    Default settings (VAX Edt editor)
.eeb    Button bar for Equation Editor (WordPerfect for Win)
.eft    High resolution screen font (ChiWriter)
.efx    Fax (Everex EFax)
.ega    EGA display font (Ventura Publisher)
.el     Elisp source code file (Emacs lisp)
.elc    Compiled ELISP code (Emacs lisp)
.elt    Event list text file (Prosa)
.emb    Everest Embedded Bank File
.emd    ABT Extended Module
.emf    Enchanced Metafile graphics
.eml    MS Outlook Express Electronic Mail
.ems    PC Tools Enhanced Menu System Config
.emu    Terminal emulation data (BITCOM)
.enc    Encoded file - UUENCODEd file (Lotus 1-2-3 - uuexe515.exe)
.enc    Music (Encore)
.end    Arrow-head definition file (CorelDRAW)
.eng    Dictionary engine (Sprint)
.eng    Graphics (charting) (EnerGraphics)
.env    Enveloper macro (WOPR)
.env    Environment file (WordPerfect for Win)
.epd    Publication (Express Publisher)
.epi    Document (Express Publisher)
.eps    Encapsulated PostScript vector graphics (Adobe Illustrator)
.eps    Printer font (Epson - Xerox...) (Ventura Publisher)
.eqn    Equation (WordPerfect for Win)
.erd    Entity Relationship Diagram graphic file (Prosa)
.erm    Entity Relationship Diagram model file (Prosa)
.err    Error log
.err    Error messages for command line compilers
.esh    Extended Shell batch file
.eth    Document (Ethnograph 3)
.etx    Structure Enhanced (setext) text
.evt    Event log
.evy    Document (WordPerfect Envoy)
.ewd    Document (Express Publisher for Windows)
.ex3    Device driver (Harvard Graphics 3.0)
.exc    Rexx source code file (VM/CMS)
.exc    Exclude file for Optimize (do not process) (QEMM)
.exe    Directly executable program (DOS)
.exm    Msdos executable, system-manager compliant (HP calculator)
.ext    Extension file (Norton Commander)
.exx    Intermediate file by MsgPut (IBM LinkWay)
.ezf    Fax (Calculus EZ-Fax)
.f      Fortran source code file
.f      Compressed file archive created by FREEZE
.f01    Fax (perfectfax)
.f06    Dos screen text font - height 6 pixels (fntcol13.zip)
.f07    Dos screen text font - height 7 pixels (fntcol13.zip)
.f08    Dos screen text font - height 8 pixels (fntcol13.zip)
.f09    Dos screen text font - height 9 pixels (fntcol13.zip)
.f10    Dos screen text font - height 10 pixels (fntcol13.zip)
.f11    Dos screen text font - height 11 pixels (fntcol13.zip)
.f12    Dos screen text font - height 12 pixels (fntcol13.zip)
.f13    Dos screen text font - height 13 pixels (fntcol13.zip)
.f14    Dos screen text font - height 14 pixels (fntcol13.zip)
.f16    Dos screen text font - height 16 pixels (fntcol13.zip)

.f2r    Linear module (music) (Farandole)
.f3r    Blocked module (music) (Farandole)
.f77    Fortran 77 source code file
.f96    Fax (Frecom FAX96)
.fac    Face graphics
.faq    Frequently Asked Questions text file
.far    Music
.fax    Fax (raster graphics) (most Fax programs)
.fc     Spell checking dictionary (Harvard Graphics 2.0)
.fcm    Binary file patch file (forward compression)(jlpak10.zip)
.fd     Declaration file (MS Fortran)
.fd     Field offsets for compiler (DataFlex)
.fdw    Form (F3 Design and Mapping)
.feb    Button bar for Figure Editor (WordPerfect for Win)
.ff     Outline font description (Agfa Compugraphics)
.fff    Fax (defFax)
.fft    Dca/FFT Final Form Text text file (DisplayWrite)
.fh3    Vector graphics (Aldus FreeHand 3.x)
.fh4    Vector graphics (Aldus FreeHand 4.x)
.fi     Interface file (MS Fortran)
.fif    Fractal Image Format file
.fil    File template (Application Generator)
.fil    Files list object file (dBASE Application Generator)
.fil    Overlay (WordPerfect)
.fin    Print-formatted text file (Perfect Writer - Scribble - MINCE)
.fit    Fits graphics
.fit    File Index Table (WindowsNT)
.fix    Patch file
.fky    Macro file (FoxPro)
.flb    Format library (Papyrus)
.flc    Animation (Autodesk Animator)
.fld    Folder (Charisma)
.fli    Tex font library (EmTeX)
.fli    Animation (Autodesk Animator)
.flm    Film Roll (AutoCAD/AutoShade)
.flo    Micrografx FlowCharter
.flt    Filter file (Micrografx Picture Publisher)
.flt    Support file (Asymetrix ToolBook) - graphics filter
.flx    Compiled binary (DataFlex)
.fm     Spreatsheet (FileMaker Pro)
.fm1    Spreadsheet (Lotus 1-2-3 release 2.x)
.fm3    Device driver (Harvard Graphics 3.0)
.fm3    Spreadsheet (Lotus 1-2-3 release 3.x)
.fmb    File Manager Button bar (WordPerfect for Win)
.fmf    Font or icon file (IBM LinkWay)
.fmk    Makefile (Fortran PowerStation)
.fmo    Compiled format file (dBASE IV)
.fmt    Format file (dBASE IV - FoxPro - Clipper 5 - dBFast)
.fmt    Style sheet (Sprint)
.fn3    Font file (Harvard Graphics 3.0)
.fnt    Font file (many)
.fnx    Inactive font (Exact)
.fo1    Font file (Borland Turbo C)
.fo2    Font file (Borland Turbo C)
.fol    Folder of saved messages (1st Reader)
.fon    Dialing directory file (Telix)
.fon    Font file (many - Windows 3.x font library)
.fon    Log of all calls (Procomm Plus)
.for    Fortran source code file
.for    Form (WindowBase)
.fot    Installed Truetype font (Windows Font Installer)
.fp     Configuration file (FoxPro)
.fpc    Catalog (FoxPro)
.fpt    Memo (FoxPro)
.fpw    Floorplan drawing (FloorPLAN plus for Windows)
.fr3    Renamed dBASE III+ form file (dBASE IV)
.frf    Font (FontMonger)
.frg    Uncompiled report file (dBASE IV)
.frm    Form (Visual Basic)
.frm    Report file (dBASE IV - Clipper 5 - dBFast)
.frm    Text (order form)
.fro    Compiled report file (dBASE IV)
.frp    Form (PerForm PRO Plus - FormFlow)
.frs    Screen Font Resource (WordPerfect for Win)
.frt    Report memo (FoxPro)
.frx    Report (FoxPro)
.fsl    Form (Paradox for Windows)
.fsm    Farandoyle Sample format music
.fst    Linkable program (dBFast)
.fsx    Data (Lotus 1-2-3)
.ftm    Font file (Micrografx)
.ftp    Configuration (FTP Software PC/TCP)
.fw     Database (FrameWork)
.fw2    Database (Framework II)
.fw3    Database (Framework III)
.fx     On-line guide (FastLynx)
.fxd    Phonebook (FAXit)
.fxp    Compiled format (FoxPro)
.fxs    Fax Transmit Format graphics (WinFax)
.g      Data chart (APPLAUSE)
.g8     Raw graphics (one byte per pixel) plane three (PicLab)
.gam    Fax (GammaFax)
.gbl    Global definitions (VAXTPU editor)
.gc1    Lisp source code (Golden Common Lisp 1.1)
.gc3    Lisp source code (Golden Common Lisp 3.1)
.gcd    Graphics
.gdf    Dictionary file (GEOS)
.ged    Editor's native file format (Arts & Letters)
.ged    Graphics editor file (EnerGraphics)
.gem    Vector graphics (GEM - Ventura Publisher)
.gen    Compiled template (dBASE Application Generator)
.gen    Generated text (Ventura Publisher)
.geo    Geode (Geoworks)
.gfb    Compressed GIF image created by GIFBLAST (gifblast.exe)
.gft    Font (NeoPaint)
.gib    Chart (Graph-in-the-Box)
.gif    Graphics Interchange Format bitmap graphics (CompuShow)
.giw    Presentation (Graph-in-the-Box for Windows)
.gl     Animation (GRASP GRAphical System for Presentation)
.glm    Datafile (Glim)
.gls    Datafile (Across)
.gly    Glossary (MS Word)
.gmf    CGM graphics (APPLAUSE)
.gmp    Geomorph tile map (SPX)
.goc    Goc source code file (Geoworks)
.goh    Goc header file (Geoworks)
.gp     Geode parameter file (Geoworks Glue)
.gph    Graph (Lotus 1-2-3/G)
.gpk    Omnigo program package
.gr2    Screen driver (Windows 3.x)
.gra    Datafile (SigmaPlot)
.grb    Ms-DOS Shell Monitor file (MS-DOS 5)
.grf    Graph file (Graph Plus - Charisma)
.grp    Group file (Windows 3.x - Papyrus)
.grp    Pictures group (PixBase)
.gry    Raw GREY graphics
.gs1    Presentation (GraphShow)
.gsd    Vector graphics (Professional Draw)
.gsw    Worksheet (GraphShow)
.gup    Data (PopMail)
.gxl    Graphics library (Genus)
.gz     Compressed file archive created by GZIP (GNU zip)
.h      Header file
.h!     On-line help file (Flambeaux Help! Display Engine)
.h++    Header file (C++)
.h--    Header file (Sphinx C--)
.ha     Compressed file archive created by HA (ha098.zip)
.hap    Compressed file archive created by HAP (hap303re.zip)
.hbk    Handbook (Mathcad)
.hdf    Hierarchical Data File graphics (SDSC Image Tools)
.hdf    Help file (Help Development Kit)
.hdl    Alternate download file listing (Procomm Plus)
.hdr    Pc-File+ Database header
.hdr    Datafile (Egret)
.hdr    Message header text (Procomm Plus - 1st Reader)
.hdw    Vector graphics (Harvard Draw)
.hdx    Help index (AutoCAD - Zortech C++)
.hex    Hex dump
.hfi    Hp Font Info file (GEM)
.hgl    Hp Graphics Language graphics
.hh     C++ header file
.hhh    Precompiled header file (Power C)
.hhp    Help information for remote users (Procomm Plus)
.hin    Molecule (HyperChem)
.hlb    Help library (VAX)
.hlp    Help information
.hmm    Alternate Mail Read option menu (Procomm Plus)
.hnc    CNC program files Heidenhain (?) dialog
.hof    Hall Of Fame (game scores)
.hp8    Ascii text HP Roman8 character set (NewWave Write)
.hpf    Hp LaserJet fonts (PageMaker)
.hpg    HPGL plotter file vector graphics (AutoCad - Harvard Graphics)
.hpi    Font information file (GEM)
.hpj    Help project (MS Help Compiler)
.hpk    Compressed file archive created by HPACK (hpack75.zip)
.hpm    Emm text (HP NewWave)

.hpm    Alternate Main menu for privileged users (Procomm Plus)
.hpp    C++ header file (Zortech C++)
.hqx    Compressed Macintosh ASCII archive created by BINHEX (xbin23.zip)
.hrf    Graphics (Hitachi Raster Format)
.hrm    Alternate Main menu for limited/normal users (Procomm Plus)
.hs2    Monochrome image (Postering)
.hsi    Handmade Software Inc. graphics - almost JPEG (Image Alchemy)
.hst    History file (Procomm Plus)
.htm    HyperText Markup Language document
.htx    Hypertext file
.hwd    Presentation (Hollywood)
.hxm    Alternate Protocol Selection menu for all users (Procomm Plus)
.hxx    C++ header file
.hy1    Hyphenation algorithms (Ventura Publisher)
.hy2    Hyphenation algorithms (Ventura Publisher)
.hyc    Data (WordPerfect)
.hyd    Hyphenation dictionary (WordPerfect for Win)
.hyp    Compressed file archive created by HYPER (hyper25.zip)
.i      Intermediate file (Borland C++ 4.5)
.iax    Bitmap graphics (IBM Image Access eXecutive)
.ibm    Compressed file archive created by ARCHDOS (Internal IBM only)
.ica    Bitmap graphics (Image Object Content Architecture)
.icb    Bitmap graphics
.icl    icon library
.icn    Icon source code file
.ico    Icon (Windows 3.x)
.id     Disk identification file
.ide    Project (Borland C++ 4.5)
.idw    Vector graphics (IntelliDraw)
.idx    Index (many - FoxPro)
.ifd    Form (JetForm Design)
.iff    Interchange File Format bitmap graphics/sound (Amiga)
.iff    Sun TAAC Image File Format (SDSC Image Tool)
.ifp    Script (KnowledgeMan)
.ifs    Fractal image compressed file (Yuvpak)
.ifs    System file (OS/2) hpfs.ifs
.ilb    Data (Scream Tracker)
.ilk    Outline of program's format (MS ILink incremental linker)
.im8    Sun raster graphics
.ima    Mirage vector graphics (EGO, Chart, Autumn)
.img    Bitmap graphics (Ventura Publisher - GEM Paint)
.imp    Spreadsheet (Lotus Improv)
.imq    Image presentation (ImageQ)
.in$    Installation file (HP NewWave)
.in3    Input device driver (Harvard Graphics 3.0)
.inb    Test script (Vermont HighTest)
.inc    Include file (several programming languages)
.ind    Index (dBASE IV)
.inf    Type 1 LaserJet font information file (soft font installers)
.inf    Information text file (ASCII)
.inf    Install script
.ini    Initialization file
.ink    Pantone reference fills file (CorelDRAW)
.ins    Data (WordPerfect)
.ins    Installation script (1st Reader)
.ins    Instrument music file (Adlib)
.int    Borland Interface Units
.int    Program saved in Internal (semi-compiled) format (Signature)
.inx    Index (Foxbase)
.io     Compressed file archive created by CPIO
.iob    3d graphics database in TDDD format
.ioc    Organizational chart (Instant ORGcharting!)
.ion    4dos descript.ion file (file descriptions)
.ipl    Pantone Spot reference palette file (CorelDRAW)
.irs    Resource (WordPerfect)
.isd    Spelling Checker dictionary (RapidFile)
.ish    Compressed file archive created by ISH
.iso    ISO-9660 table
.it     Settings (intalk)
.itf    Interface file (JPI TopSpeed Pascal)
.iw     Presentation flowchart (IconAuthor - HSC InterActive)
.iwa    Text file (IBM Writing Assistant)
.iwp    Text file (Wang)
.izt    Izl binary token file (IZL)
.jas    Graphics
.jav    Java source code file
.jbd    Datafile (SigmaScan)
.jbx    Project file (Project Scheduler 4)
.jet    Fax (Hybrid JetFax)
.jff    Bitmap graphics (JPEG File Interchange Format)
.jor    Journal file SQL
.jou    Journal backup (VAX Edt editor)
.jpc    Graphics (Japan PIC)
.jpg    Bitmap graphics (Joint Photography Experts Group)
.jtf    Fax (Hayes JT Fax)
.jtf    Bitmap graphics (JPEG Tagged Interchange Format)
.jw     Text document (JustWrite)
.jwl    Library (JustWrite)
.jzz    Spreatsheet (Jazz)
.kar    Midi file with karaoke word track
.kb     Keyboard script (Borland C++ 4.5)
.kb     Program source (Knowledge Pro)
.kbd    Keyboard mapping (LocoScript - Signature - Procomm Plus)
.kbm    Keyboard mapping (Reflection 4.0)
.kcl    Lisp source code (Kyoto Common Lisp)
.kex    Macro (KEDIT)
.key    Datafile (Forecast Pro)
.key    Keyboard macros
.key    Security file eg. Shareware Registration info
.kpp    Toolpad (SmartPad)
.kps    Ibm KIPS bitmap graphics
.kyb    Keyboard mapping (FTP Software PC/TCP)
.l      Lex source code file
.l      Lisp source code file
.l      Linker directive file (WATCOM wlink)
.lab    Datafile (NCSS - SOLO)
.lab    Mailing labels (Q+E for MS Excel)
.lay    Word chart layout (APPLAUSE)
.lbg    Label generator data (dBASE IV)
.lbl    Label (dBASE IV - Clipper 5 - dBFast)
.lbm    Bitmap graphics (DeluxePaint)
.lbm    Linear bitmap graphics (XLib)
.lbo    Compiled label (dBASE IV)
.lbr    Compressed file archive created by LU (lue220.arc)
.lbr    Display driver (Lotus 1-2-3)
.lbt    Label memo (FoxPro)
.lbx    Label (FoxPro)
.lcf    Linker Control File (Norton Guides compiler)
.lck    Lockfile (Paradox)
.lcl    Data (FTP Software PC/TCP)
.lcn    Lection (WordPerfect)
.lcs    Datafile (ACT! History Files)
.lcw    Spreadsheet (Lucid 3-D)
.ld     Long Distance codes file (Telix)
.ld1    Overlay file (dBASE)
.ldb    Data (MS Access)
.ldf    Library definition file (Geoworks Glue)
.les    Lesson (check *.cbt)
.lev    Level file (NetHack 3.x)
.lex    Lexicon (dictionary) (many)
.lft    Laser printer font (ChiWriter)
.lg     Logo procedure definitions (LSRHS Logo)
.lgo    Logo for header and footer (SuperFax)
.lgo    Startup logo code (Windows 3.x)
.lha    Compressed file archive created by LHA/LHARC (lha255b.exe)
.lhw    Compressed Amiga file archive created by LHWARP
.lib    Library file (several programming languages)
.lif    Logical Interchange Format data file (Hewlett-Packard)
.lif    Compressed file archive
.lim    Compressed file archive created by LIMIT (limit12.zip)
.lin    Line types (AutoCAD)
.lis    Listing (VAX)
.lj     Text file for HP LJ II printer
.ll3    Laplink III related file (document) (LapLink III)
.lnk    Linker response file (.RTLink)
.lod    Load file
.log    Log file
.lpc    Printer driver (TEKO)
.lrf    Linker response file (MS C/C++)
.lrs    Language Resource File (WordPerfect for Win)
.lsl    Lotus Script Library
.lsp    Lisp source code file (Xlisp)
.lss    Spreadsheet (Legato)
.lst    Keyboard macro (1st Reader)
.lst    List file (archive index - compiler listfile)
.lst    Spool file (Oracle)
.ltm    Form (Lotus Forms)
.lwd    Text document (LotusWorks)
.lwp    Lotus Wordpro 96/97 File
.lwz    MS Linguistically Enhanced Sound File
.lyr    DataCAD Layer File
.lzd    Difference file for binaries (Ldiff 1.20)
.lzh    Compressed file archive created by LHA/LHARC (lha255b.exe)
.lzs    Compressed file archive created by LARC (larc333.zip)
.lzw    Compressed Amiga file archive created by LHWARP

.lzx    Compressed File
.m      Function (program) (Matlab)
.m      Macro module (Brief)
.m      Standard package (Mathematica)
.m11    Text file (MASS11)
.m3     Modula 3 source code file
.m3d    3d animation macro
.m4     M4 preprocessor file (unix)
.m_u    Backup of boot sector, FAT and boot dir (MazeGold)
.ma3    Macro (Harvard Graphics 3.0)
.mac    Bitmap graphics (Macintosh MacPaint)
.mac    Macro
.mag    Woody Lynn's MAG graphics format (MPS Magro Paint System)
.mai    Mail (VAX)
.mak    Makefile
.mak    Project file (Visual Basic)
.man    Command manual
.map    Color palette
.map    Format data (Micrografx Picture Publisher)
.map    Linker map file
.map    Map (Atlas MapMaker)
.map    Network map (AccView)
.mar    Assembly program (VAX Macro)
.mas    Smartmaster set (Freelance Graphics)
.mat    Data file (Matlab)
.max    Max source code file
.mb     Memo field values for database (Paradox)
.mbk    Multiple index file backup (dBASE IV)
.mbx    Mailbox (Eudora/Zerberus)
.mcc    Configuration file (Mathcad)
.mcd    Document (Mathcad)
.mcf    Font file (Mathcad)
.mci    Mci command script (Media Control Interface)
.mcp    Application script (Capsule)
.mcp    Printer driver (Mathcad)
.mcw    Text file (MacWrite II)
.md     Compressed file archive created by MDCD (mdcd10.arc)
.mda    Data (MS Access)
.mdb    Database (MS Access)
.mdl    Model (3D Design Plus)
.mdl    Spreadsheet (CA-Compete!)
.mdm    Modem definition (TELIX)
.mdt    Data table (MS ILink incremental linker)
.mdx    Multiple index file (dBASE IV)
.me     Usually ASCII text file READ.ME
.meb    Macro Editor bottom overflow file (WordPerfect Library)
.med    Macro Editor delete save (WordPerfect Library)
.med    Music (OctaMED)
.mem    Macro Editor macro (WordPerfect Library)
.mem    Memory variable save file (Clipper - dBASE IV - FoxPro)
.meq    Macro Editor print queue file (WordPerfect Library)
.mer    Macro Editor resident area (WordPerfect Library) (vakioalue)
.mes    Macro Editor work space file (WordPerfect Library)
.mes    Message
.met    Macro Editor top overflow file (WordPerfect Library)
.met    Document (Omnipage Pro)
.meu    Menu group (DOS Shell)
.mex    Mex file (executable command) (Matlab)
.mex    Macro Editor expound file (WordPerfect Library)
.mf     Metafont text file
.mgf    Font (Micrografx)
.mht  	MS MHTML Document
.mib    Snmp MIB file
.mid    Standard MIDI file (music synthetizers)
.mii    Datafile (MicroStat-II)
.mix    Object file (Power C)
.mk     Makefile
.mke    Makefile (MS Windows SDK)
.mki    Japanese graphics MAKIchan format (MagView 0.5)
.mks    Data (TACT)
.ml3    Project (Milestones 3.x)
.mlb    Macro library file (Symphony)
.mm     Text file (MultiMate Advantage II)
.mmf    Mail message file (MS Mail)
.mmm    Movie (RIFF RMMP format) (MacroMind Director 3.x)
.mmo    Memo writer file (RapidFile)
.mmp    Output video format from Bravado board
.mnd    Menu source (AutoCAD Menu Compiler)
.mng    Map (DeLorme Map'n'Go)
.mnt    Menu memo (FoxPro)
.mnu    Advanced macro (HP NewWave)
.mnu    Menu (AutoCAD Menu Compiler - Norton Commander - Signature)
.mnx    Compiled menu (AutoCAD)
.mnx    Menu (FoxPro)
.mny    Account book (MS Money)
.mob    Device definition (PEN Windows)
.mod    Modula-2 source code file (Clarion Modula-2)
.mod    Windows kernel module
.mod    Music (FastTracker - many)
.mon    Monitor description (ReadMail)
.mov    Movie (AutoCAD AutoFlix)
.mp2    Mpeg audio file (xing)
.mpc    Calender file (MS Project)
.mpg    Mpeg animation
.mpm    Mathplan macro (WordPerfect Library)
.mpp    Project file (MS Project)
.mpr    Generated program (FoxPro)
.mpt    Bitmap graphics (Multipage TIFF)
.mpv    View file (MS Project)
.mpx    Compiled menu program (FoxPro)
.mrb    Multiple Resolution Bitmap graphics (MS C/C++)
.mrs    Macro Resource file (WordPerfect for Win)
.msc    Microsoft C makefile
.msg    Message
.msp    Bitmap graphics (Microsoft Paint)
.mss    Manuscript text file (Perfect Writer - Scribble - MINCE - Jove)
.mst    Minispecification file (Prosa)
.mst    Setup script (MS Windows SDK)
.msw    Text file (MS Word)
.msx    Compressed CP/M file archive created by MSX
.mth    Math file (Derive)
.mtm    Multitracker Module music
.mtw    Datafile (Minitab)
.mu     Menu (Quattro Pro)
.mus    Sound file (MusicTime)
.mvf    Stop frame file (AutoCAD AutoFlix)
.mvi    Movie command file (AutoCAD AutoFlix)
.mvw    Log file (Saber LAN)
.mwf    Animation (ProMotion)
.mxt    Data (MS C)
.myp    Presentation (MM Make Your Point)
.nap    Naplps file (VideoShow) (EnerGraphics)
.nb     Text file (Nota Bene)
.nc     Graphics (netcdf)
.nc     Instructions for NC (Numerical Control) machine (CAMS)
.ncc    Cnc (Computer Numeric Control) control file (CamView 3D)
.ncd    Norton Change Directory support file (Norton Commander)
.ndb    Network database (Intellicom - Compex)
.ndx    Index file (dBASE II - III - IV - dBFast)
.neo    Raster graphics (Atari Neochrome)
.net    Network configuration/info file
.new    New info
.nfo    Info file
.ng     Online documentation database (Norton Guide)
.nlm    Netware Loadable Module
.nlx    Form (FormWorx 3.0)
.np     Project schedule (Nokia Planner) (Visual Planner 3.x)
.npi    Source for DGEN.EXE intepreter (dBASE Application Generator)
.nsf    Lotus Notes / Domino database
.nst    Music (NoiseTracker)
.nt     Startup files (Windows NT)
.ntf    Lotus Notes / Domino template file
.ntr    Executable ASCII text file (strip header and rename) (netrun31.zip)
.nts    Tutorial (Norton)
.nts    Executable ASCII text file (strip header and rename) (netsend1.zip)
.ntx    Index (Clipper 5)
.nuf    Message for new users on their 1st call (Procomm Plus)
.nws    Info text file (latest news) (ASCII)
.nxt    Sound (NeXT format)
.o      Object file (unix - Atari - GCC)
.o$$    Outfile (Sprint)
.oaz    Fax (NetFax Manager)
.ob     Object cut/paste file (IBM LinkWay)
.obj    Object code (Intel Recolatable Object Module)
.obr    Object browser data file (Borland C++)
.obs    Script (ObjectScript)
.obv    Visual interface (ObjectScript)
.ocf    Object Craft File (Object Craft)
.ocr    Incoming fax transcribed to text (FAXGrapper)
.ocx    OLE custom control
.odl    Type library source (Visual C++)
.ofd    Form definition (ObjectView)
.off    Object File Format vector graphics
.okt    Music (Oktalizer)
.olb    Object library (VAX)

.old    Backup file
.oli    Text file (Olivetti)
.oom    Swap file (Shroom)
.opn    Active options (Exact)
.opt    Optimize support file (QEMM)
.opw    Organization chart (Org Plus for Windows)
.opx    Inactive options (Exact)
.ora    Parameter file (Oracle)
.org    Calendar file (Lotus Organizer)
.otl    Outline font description (Z-Soft Type Foundry)
.otx    Text file (Olivetti Olitext Plus)
.out    Output file
.ov1    Overlay file (part of program to be loaded when needed)
.ov2    Overlay file (part of program to be loaded when needed)
.ovd    Datafile (ObjectVision)
.ovl    Overlay file (part of program to be loaded when needed)
.ovr    Overlay file (part of program to be loaded when needed)
.p      Pascal source code file
.p      Rea-C-Time application parameter file (ReaGeniX code generator)
.p      Picture file (APPLAUSE)
.p16    Music (16 channels) (ProTracker Studio 16)
.p22    Patch file (Patch22)
.p65    Adobe Pagemaker v6.5
.pa1    Worktable (PageAhead)
.pac    Stad Image (graphics ?)
.pac    Package (SBStudio II)
.pad    Keypad definition (Telemate)
.pak    Compressed file archive created by PAK (pak251.exe)
.pal    Color palette
.pan    Printer-specific file (copy to coreldrw.ink) (CorelDRAW)
.par    Parts application (Digitalk PARTS)
.par    Parameter file (Fractint)
.par    Permanent output file (Windows 3.x)
.pas    Pascal source code file
.pat    Hatch patterns (AutoCAD - Photostyler)
.pat    Vector fill files (CorelDRAW)
.pb     Fax (FAXability Plus)
.pb     Phonebook (WinFax Pro)
.pb     Setup file (PixBase)
.pb1    Document (First Publisher for Windows)
.pba    Powerbasic BASIC source code (Genus)
.pbd    Phone book (FaxNOW! - Faxit)
.pbi    Powerbasic include file (Genus)
.pbi    Profiler Binary Input (MS Source Profiler)
.pbl    Powerbasic library (Genus)
.pbm    Pbm Portable Bit Map graphics
.pbm    Planar bitmap graphics (XLib)
.pbo    Profiler Binary Output (MS Source Profiler)
.pbt    Profiler Binary Table (MS Source Profiler)
.pc     Text file containing IBM PC specific info
.pc3    Custom palette (Harvard Graphics 3.0)
.pc8    Ascii text IBM8 character set (NewWave Write)
.pcc    Cutout picture vector graphics (PC Paintbrush)
.pcd    Graphics (Kodak PhotoCD)
.pcf    Profiler Command File (MS Source Profiler)
.pch    Patch file
.pch    Precompiled header (MS C/C++)
.pcj    Multimedia authoring tool graphics (IBM's Linkaway-Live)
.pck    Pickfile (Turbo Pascal)
.pcl    HP-PCL graphics data (HP Printer Control Language)
.pct    Bitmap graphics (Macintosh b&w PICT1 - color PICT2)
.pcw    Text file (PC Write)
.pcx    Bitmap graphics (PC Paintbrush)
.pda    Bitmap graphics
.pdb    Data (TACT)
.pdd    Adobe PhotoDeluxe Image
.pdf    Package Definition File
.pdf    Graphics file (ED-SCAN 24bit format)
.pdl    Project Description Language file (Borland C++ 4.5)
.pds    Pds graphics
.pds    Pldasm source code file (hardware assembly)
.pdv    Printer driver (Paintbrush)
.pdw    Document (Professional Draw)
.peb    Program Editor bottom overflow file (WordPerfect Library)
.ped    Program Editor delete save (WordPerfect Library)
.pem    Program Editor macro (WordPerfect Library)
.peq    Program Editor print queue file (WordPerfect Library)
.per    Program Editor resident area (WordPerfect Library) (vakioalue)
.pes    Program Editor work space file (WordPerfect Library)
.pet    Program Editor top overflow file (WordPerfect Library)
.pfa    Type 3 font file (unhinted PostScript font)
.pfb    Type 1 font file
.pfc    Text file (First Choice)
.pfk    Programmable function keys (XTreePro)
.pfm    Windows Type 1 font metric file
.pfs    Database (PFS:FILE) - text file (PFS:Write)
.pft    Printer font (ChiWriter)
.pg     Page cut/paste file (IBM LinkWay)
.pgi    Printer Graphics File device driver (PGRAPH library)
.pgm    Portable Grayscale bitMap graphics
.pgm    Program (Signature)
.pgp    Support file (Pretty Good Privacy RSA System)
.pgs    Manual page (man4dos)
.ph     Optimized .goh file (Geoworks)
.ph     Perl header file
.ph     Phrase-table (MS C/C++)
.phn    Phone list (UltraFax - QmodemPro)
.pho    Phone database (Metz Phone for Windows)
.phr    Phrases (LocoScript)
.pic    Pixar picture file (SDSC Image Tool)
.pic    Bitmap graphics (Macintosh b&w PICT1 - color PICT2)
.pic    Bitmap graphics (many eg. Lotus 1-2-3 - PC Paint)
.pif    Program Information File (Windows 3.x)
.pif    Vector graphics GDF format (IBM mainframe computers)
.pit    Compressed Mac file archive created by PACKIT (unpackit.zoo)
.pix    Alias image file (SDSC Image Tool)
.pj     Project (CA-SuperProject)
.pjt    Project memo (FoxPro)
.pjx    Project (FoxPro)
.pk     Packed bitmap font bitmap file (TeX DVI drivers)
.pka    Compressed file archive created by PKARC
.pkg    Installer script (Next)
.pkt    Fidonet packet
.pl     Perl source code file
.pl     Prolog source code file
.pl     Property List font metric file (TeX)
.pl     Palette (Harvard Graphics)
.pl1    Room plan (3D Home Architect)
.pl3    Chart palette (Harvard Graphics 3.0)
.plb    Library (FoxPro)
.plc    Add-in file (functions - macros - applications) (Lotus 1-2-3)
.pll    Pre-linked library (Clipper 5)
.pln    Spreadsheet (WordPerfect for Win)
.plt    Hpgl plotter file vector graphics (AutoCAD)
.plt    Palette
.plt    Pre-linked transfer file (Clipper 5)
.ply    Data (PopMail)
.ply    Presentation screen (Harvard Spotlight)
.pm     Bitmap graphics (Presentation Manager)
.pm3    Document (PageMaker 3)
.pm4    Document (PageMaker 4)
.pm5    Document (PageMaker 5)
.pmc    Graphics (A4TECH Scanner)
.pmm    Program file (Amaris BTX/2)
.pn3    Printer device driver (Harvard Graphics 3.0)
.png    Bitmap graphics (Portable Network Graphics)
.pnm    Pbm Portable aNy Map (PNM) graphics
.pnt    Macintosh painting
.pnt    Qwk reader pointer file (MarkMail 2.x)
.poh    Optimized .goh file (Geoworks)
.pop    Messages index (PopMail)
.pop    Pop-up menu object (dBASE Application Generator)
.pov    Raytraced graphics image (Persistence Of Vision)
.pow    Chord chart (PowerChords)
.pp     Compressed Amiga file archive created by POWERPACKER
.ppb    Button bar for Print Preview (WordPerfect for Win)
.ppl    Polaroidpaletteplus ColorKey device driver (Harvard Graphics 3.0)
.ppm    Portable Pixel Map graphics
.ppo    Pre-processor output (Clipper 5)
.ppp    Publication (PagePlus)
.pps    Storyboard (Personal Producer)
.ppt    General file extension (PowerPoint)
.pr2    Presentation (Aldus Persuasion 2.x)
.pr2    Printer driver (dBASE IV)
.pr3    Postscript printer driver (dBASE IV)
.pr3    Presentation (Aldus Persuasion 3.x)
.prd    Printer driver (many)
.pre    Presentation (Freelance Graphics)
.pre    Settings (Programmer's WorkBench - MS C/C++)
.prf    Pixel Run Format graphics (Improces - Fastgraph)
.prf    Printer driver (dBASE IV)
.prf    Profiler output
.prg    Program (Atari)
.prg    Program source (dBASE IV - FoxPro - Clipper 5 - dBFast)
.pri    Printer definitions (LocoScript)

.prj    Project
.prm    Parameters
.prn    Printer driver (Signature)
.prn    Text file (Lotus 1-2-3 - Symphony)
.pro    Prolog source code file
.pro    Graphics profile file (DOS)
.prs    Printer Resource eg. fonts (WordPerfect for Win)
.prs    Presentation (Harvard Graphics Win)
.prs    Procedure (dBASE IV)
.prt    Printer driver (Dr.Halo)
.prx    Compiled program (FoxPro)
.ps     Postscript file (text/graphics) (ASCII)
.psd    Graphics (Photoshop 3.0)
.pse    Bitmap graphics (IBM printer Page SEgment)
.psf    Outline PostScript printer font (ChiWriter)
.psm    Music (MASI - ProTracker)
.psm    Symbol table of IDE (Turbo Pascal)
.psp    Procedure (Prodea Synergy)
.pt3    Device driver (Harvard Graphics 3.0)
.pt3    Template (PageMaker 3)
.pt4    Template (PageMaker 4)
.ptb    Script (PubTech BatchWorks)
.ptm    Macro (PubTech BatchWorks)
.ptr    Qwk reader pointer file (QMail)
.pub    Page template (MS Publisher)
.pub    Public key ring file (Pretty Good Privacy RSA System)
.pub    Publication (Ventura Publisher - 1st Publisher)
.put    Compressed file archive created by PUT (put334.zip)
.pvd    Script (Instalit)
.pvl    Library (Instalit)
.pvt    Local Fidonet pointlist
.pw     Text file (Professional Write)
.pwl    Password List
.pwp    Text document (Professional WritePlus)
.px     Primary database index (Paradox)
.py     Python script file
.pyc    Compiled PYTHON script file
.pzd    Default settings (Pizazz Plus)
.pzo    Overlay file (Pizazz Plus)
.pzp    Palette (Pizazz Plus)
.pzs    Settings (Pizazz Plus)
.pzt    Transfer file (Pizazz Plus)
.pzx    Swap file (Pizazz Plus)
.qag    Quick Access Group (Norton Desktop)
.qap    Application (Omnis Quartz)
.qbe    Saved query (Query By Example) (dBASE IV - Quattro Pro)
.qbo    Compiled query (dBASE IV)
.qbw    Spreadsheet (QuickBooks for Windows)
.qd0    Data file - segment 10 (Omnis Quartz)
.qd1    Data file - segment 1 (Omnis Quartz)
.qd2    Data file - segment 2 (Omnis Quartz)
.qd3    Data file - segment 3 (Omnis Quartz)
.qd4    Data file - segment 4 (Omnis Quartz)
.qd5    Data file - segment 5 (Omnis Quartz)
.qd6    Data file - segment 6 (Omnis Quartz)
.qd7    Data file - segment 7 (Omnis Quartz)
.qd8    Data file - segment 8 (Omnis Quartz)
.qd9    Data file - segment 9 (Omnis Quartz)
.qdk    Backup of startup files created by Optimize (QEMM)
.qdv    Graphics (Steve Blackstock Giffer)
.qef    Query file (Q+E for MS Excel)
.qfx    Fax (QuickLink)
.qlb    Quick library (MS C/C++)
.qlc    Data (PostScript help file) atmfonts.qlc
.qlp    Printer driver (QuickLink)
.qm4    Options or services file (QMail 4.x Mail Door)
.qpr    Generated query program (FoxPro)
.qpr    Print queue device driver (OS/2)
.qpx    Compiled query program (FoxPro)
.qrs    Equation Editor support file (WordPerfect for Win)
.qrt    Qrt ray tracing graphics
.qry    Query (dBASE IV)
.qt     Quicktime movie (animation)
.qwk    Qwk reader message file
.qxd    Document (QuarkXPress)
.qxl    Element library (QuarkXPress)
.r      Ratfor (FORTRAN preprosessor) file
.r8     Raw graphics (one byte per pixel) plane one (PicLab)
.r8p    Pcl 4 bitmap font file (Intellifont)
.ra     Music (RealAudio)
.ram    Ramfile (RealAudio)
.rar    Compressed file archive created by RAR (rar1_402.exe)
.ras    Sun Rasterfile graphics
.rat    Datafile (RATS)
.raw    Raw RGB 24-bit graphics
.rbf    Datafile (Rbase)
.rc     Resource script (MS C/C++ - Borland C++)
.rc     Configuration (emacs)
.rcg    Netscape newsgroup file (netsc.rcg)
.rdf    Compiled UIC source code (Geoworks UI Compiler)
.rdi    Device-independent bitmap file (RIFF RDIB format)
.rdx    Datafile (Reflex)
.rec    Datafile (EpiInfo)
.rec    Record file (Sprint)
.rec    Recorded macro file (Windows 3.x)
.red    Path info (Clarion Modula-2)
.ref    Cross-reference
.reg    Ole Registration (Windows 3.x)
.reg    Registration (Corel programs)
.rem    Remarks
.rep    Qwk reader reply file
.rep    Report (Report Designer - CodeReporter - DataBoss)
.req    Request
.res    Compiled resource (MS C/C++ - Borland C++)
.res    Dbase resources (dBASE IV)
.rev    Revision file (Geoworks)
.rex    Rexx source code file
.rex    Report definition (Oracle)
.rez    Resource file
.rf     Sun raster graphics
.rft    Dca/RFT Revisable Format Text file (IBM DisplayWrite 4.0-5.1)
.rgb    Sgi RGB image file (SDSC Image Tool)
.rgx    Symbol tables etc. info (ReaGeniX code generator)
.rh     Resource header file (Borland C++ 4.5)
.ri     Data (Lotus 1-2-3)
.rib    Graphics in Renderman format (3DReality)
.ric    Fax (Ricoh)
.rif    Riff bitmap graphics (Fractal Design Painter)
.rip    Graphics (Remote Access)
.rix    Bitmap graphics (ColorRIX VGA Paint)
.rl4    Bitmap graphics
.rl8    Bitmap graphics
.rla    Wavefront raster image file (SDSC Image Tool)
.rlb    Data (Harvard Graphics Win) hgw.rlb
.rlc    Graphics 1bit/pixel scanner output
.rle    Utah Run Length Encoded raster graphic (SDSC Image Tool)
.rlz    Realizer source code file (CA-Realizer)
.rmi    Midi file (RIFF RMID format)
.rmk    Makefile (Clipper RMake)
.rn     Xpl program for Nota Bene users
.rnd    Rendering Slide (AutoCAD AutoShade)
.rno    Runoff file (VAX)
.rol    Fm music Adlib Music File (Roland)
.rpd    Database (RapidFile)
.rpl    Text document (Replica)
.rpt    Report
.rs     Data file (Amiga Resource - Reassembler)
.rs_    Resource fork of a Macintosh file (Mac-ette)
.rsc    Resource file
.rsp    Response file
.rtf    Rich Text Format text file (many - Windows Word)
.rtf    Windows Help file script
.rtl    Run Time Library (NU 7.0)
.rtl    Text file
.rtp    Rtpatch software update package data file
.rts    Runtime library file (CA-Realizer)
.rvw    Review
.rws    Resource Workshop data file (Borland C++)
.rwx    Script (RenderWare)
.s      Assembly source code file (unix)
.s      Scheme source code file
.s$$    Temporary sort file (Sprint)
.s3m    Music (16 channels) (Scream Tracker 3.0)
.sal    Datafile (SORITEC)
.sam    Text file (Samna - Lotus Ami/Ami Pro)
.sar    Compressed file archive created by SAR (sar1.zip)
.sav    Backup file (saved file)
.sav    Configuration
.sav    Saved game situation (eg. NetHack)
.sb     Audio file (signed byte)
.sbd    Storyboard (Storyboard Editor)
.sbi    Sound Blaster Instrument file (Creative Labs)
.sbp    Dml program (Superbase 4)
.sbr    Support file (Source Browser)
.sbt    Notes related to record (Suberbase 4 Windows)

.sc     Pal script (Paradox)
.sc     Display driver (Framework II)
.sc3    Renamed dBASE III screen mask file (dBASE IV)
.sc3    Screen device driver (Harvard Graphics 3.0)
.sca    Datafile (SCA)
.scc    Text file
.scd    Scodl Scan Conversion Object Description Language graphics
.scf    Multimedia show (ScoreMaker)
.scf    Spelling checker configuration (Symphony)
.sch    Project schedule (Schedule Publisher)
.sch    Schematics file (ORCAD)
.sci    System Configuration Information
.sci    Fax (SciFax)
.scm    Scheme source code file
.scn    Screen file (Kermit)
.sco    High score
.scp    Script (BITCOM)
.scr    Debug source code file (DOS Debug)
.scr    Screen - screen snapshot (dBASE IV - Procomm Plus)
.scr    Screen font (LocoScript)
.scr    Screen saver (Windows 3.x)
.scr    Script (Kermit - 1st Reader)
.sct    Screen memo (FoxPro)
.scx    Bitmap graphics (ColorRIX)
.scx    Chart (Stanford Chart)
.scx    Screen (FoxPro)
.scy    Security file (ReaGeniX)
.sda    Fidonet's Software Distribution Network file archive description
.sdf    System Data Format file (fixed lenght ASCII text)
.sdi    Software Distribution Network Info file
.sdn    Software Distribution Network compressd file archive (pak251.exe)
.sea    Self-Extracting compressed Macintosh file Archive
.sec    Secret key ring file (Pretty Good Privacy RSA System)
.sec    Secured animation file (Disney Animation Studio)
.sep    Printer separator page
.seq    Atari animation file
.seq    Sequential Instruction File (Bubble Chamber)
.ses    Session info (Clarion Modula-2)
.set    Configuration (1st Reader)
.set    Driver sets created by Install (Symphony)
.set    Setup options file
.sf     Ircam Sound File (CSound package - MixView sound sample editor)
.sf     Wps attribute storage (OS/2 WorkPlace Shell) wp_root.sf
.sfi    Graphics (SIS Framegrabber)
.sfi    Printer font (HP LaserJet landscape) (Ventura Publisher)
.sfl    Pcl 4 bitmap font (landscape) (Intellifont) (Ventura Publisher)
.sfn    Font (SPX)
.sfp    Pcl 4 bitmap font (portrait) (Intellifont) (Ventura Publisher)
.sfs    Pcl 5 scalable font file (Intellifont)
.sft    Screen font (ChiWriter)
.sg1    Graphics (Stanford Graphics)
.sgf    Document with graphics (Starwriter)
.sgi    Graphics (IRIS - Silicon Graphics)
.sgp    Statistics (STATGRAPHICS Plus)
.sgt    Save/get keyboard macro (Signature)
.sh     Unix shell script
.sh     Unix ASCII file archive created by SHAR (unshar.zip)
.sh3    Presentation (Harvard Graphics 3.0)
.shb    Background (CorelShow)
.shg    Segmented-graphics bitmap
.shk    Compressed Apple II file archive created by SHRINKIT
.shm    Shell macro (WordPerfect Library)
.shp    Shape file and source file for text fonts (AutoCAD)
.shr    Unix ASCII file archive created by SHAR (unshar.zip)
.shs    Scrap Object
.shw    Presentation (Harvard Graphics 2.0 - CorelShow)
.shw    Slide show (WordPerfect Presentations)
.shx    Shape entities (AutoCAD)
.sif    Setup Installation Files info (Windows NT Setup)
.sig    Current program settings (Signature)
.sig    Signature file (PopMail)
.sik    Backup file (Sicherungskopie) (MS Word)
.sit    Compressed Macintosh archive created by STUFFIT (unsit30.zip)
.sl     S-Lang source code file
.slb    Slide library (AutoCAD)
.slc    Compiled SALT script (Telix)
.sld    Slide (AutoCAD)
.sli    Slide (MAGICorp Slide Service)
.slk    Sylk Symbolic Link format data file (MultiPlan)
.sll    Sound data file
.slt    Salt Script Application Language for Telix script source (Telix)
.sm     Smalltalk source code file
.sm     Maillist (SoftSpoken Mailer)
.sm     Script (ScriptMaker)
.sm     Text file (Samna Word)
.smf    Fax (SMARTFAX)
.smm    Macro (Ami Pro)
.smp    Sample (sound file)
.smt    Text file (Smart Ware II)
.snd    Digitized sound file (Macintosh/ATARI/PC)
.sng    Song (midi sound) (Midisoft Studio - Prism)
.sno    Snobol4 source code file
.snp    Output video format from Computer Eyes equipment
.sol    Solution eg. game walkthroughs
.som    Network serial numbers (Quattro Pro)
.som    Sort information (Paradox)
.son    Song (SBStudio II)
.sou    Sound data (sound tool)
.sp     Compressed file archive created by SPLINT (unix)
.spc    Program (MS Multiplan)
.spc    Temporary file (WordPerfect for Win)
.spd    Scalable font (Speedo) (Harvard Graphics 3.0)
.spf    Slide presentation file (EnerGraphics)
.spg    Glossary (Sprint)
.spi    Graphics (Siemens and Philips scanner)
.spl    Compressed file archive created by SPLINT (splint.arc)
.spl    Customized printer driver (Sprint)
.spl    Personal spell dictionary (Signature)
.spl    Print spooling file (Windows 3.x)
.spl    Sample
.spm    Data (WordPerfect) wp{wp}.spm
.spp    Printer file (Sprint)
.spr    Document letter (Sprint)
.spr    Genarated screen program (FoxPro)
.spr    Sprite
.sps    Spssx source code file (VAX/VMS)
.sps    Screen driver (Sprint)
.spt    Spitbol source code file
.spt    Support file (MITAC disk/system management utility pack)
.spw    Worksheet (SigmaPlot)
.spx    Compiled screen program (FoxPro)
.sql    SQL report or query
.sqz    Compressed file archive created by SQUEEZE (sqz1083e.exe)
.src    Source (DataFlex)
.srf    Sun Raster File graphics
.srp    Script (QuickLink)
.ss     Bitmap graphics (Splash)
.ssd    Datafile (SAS/PC)
.ssm    RealPlayer Standard Streaming Metafile
.ssp    Datafile (SAS Transport)
.st     Smalltalk source code file (Little Smalltalk)
.st     Instrument library (Scream Tracker)
.st     Stamp (NeoPaint)
.sta    Saved state (Reflection 4.0)
.sta    Stack (Spinmaker Plus)
.stb    Stub library (Genus GX Kernel)
.std    State Transition Diagram graphic file (Prosa)
.std    Standard (something..) (LocoScript)
.stf    Compressed file archive created by SHRINKTOFIT
.stm    State Transition Diagram model file (Prosa)
.stm    Music (Scream Tracker)
.sto    Pascal stub OBJ file (Genus GX Kernel)
.str    Structure list object file (dBASE Application Generator)
.sts    Project status info (MS C/C++)
.sts    Song format (Scream Tracker)
.stw    Data file (SmartTerm for Windows)
.stx    Electronic book (SmarText)
.stx    Tax form (CA-Simply Tax)
.sty    Style library or sheet (many text and graphics programs)
.sui    Suit library (Simple User Interface Toolkit)
.sum    Summary
.sun    Sun rasterfile graphics
.sup    Supplementary dictionary (WordPerfect for Win)
.svd    Autosave file for document (MS Word)
.svg    Autosave file for glossary (MS Word)
.svs    Autosave file for style sheet (MS Word)
.sw     Audio file (signed word)
.swg    Swag packet (SWAG Reader)
.swp    Document backup (Sprint)
.swp    Swap file (DOS)
.sy1    Smartpix symbol library (Ami Pro)
.sy3    Symbol file (Harvard Graphics 3.0)
.syd    Backup of startup files created by QEMM (?) autoexec.syd
.sym    Precompiled headers (Borland C++)
.sym    Program symbol table (many compilers and linkers)

.sym    Symbol file (Harvard Graphics 2.0)
.syn    Sdsc Synu image file (SDSC Image Tool)
.syn    Synonym file (MS Word 5)
.sys    Datafile (SYGRAPH - SYSTAT - SPSS/PC)
.sys    System file - device driver or hardware configuration info (DOS)
.syw    Graphics symbols (Harvard Graphics Win)
.t      Tads source
.t      Tape Archive (tar) without compression
.t      Tester symbol table (ReaGeniX code generator)
.t44    Temporary file for Sort or Index (dBASE IV)
.t64    Program (C64S emulator)
.tag    Query tag name (DataFlex)
.tah    Turbo Assembler Help file (Borland C++)
.tal    Text illustration (TypeAlign)
.tar    Compressed file archive created by TAR (pax2exe.zoo)
.taz    Compressed ASCII file archive created by TAR and COMPRESS (.tar.Z)
.tb1    Font file (Borland Turbo C)
.tb2    Font file (Borland Turbo C)
.tbf    Fax (Imavox TurboFax)
.tbk    Memo backup (dBASE IV - FoxPro)
.tbk    Toolbook (Asymetrix ToolBook)
.tbl    Graphics (native format) (PageMaker TableEditor)
.tbl    Table of values (OS/2)
.tbs    Text elements ?? (Textbausteine) (MS Word)
.tbx    Table (Project Scheduler 4)
.tc     Configuration (Turbo C - Borland C++)
.tch    Turbo C Help file (Borland C++)
.tcl    Tool Command Language source code (Swat)
.tcw    Drawing (TurboCAD for Windows)
.td     Configuration file (Turbo Debugger for DOS)
.td0    Disk image file (Teledisk)
.td2    Configuration file (Turbo Debugger for Win32)
.tdb    Database (TACT)
.tdf    Font (TheDraw)
.tdf    Typeface definition file (Speedo)
.tdh    Help file (Turbo Debugger)
.tdk    Keystroke recording file (Turbo Debugger)
.tds    Symbol table (Turbo Debugger)
.tdw    Configuration file (Turbo Debugger for Windows)
.tef    Fax (Relisys TEFAX)
.tel    Host file (Telnet)
.tem    Turbo Editor Macro Language script (Borland C++)
.tem    Input template (IconAuthor)
.tex    Tex text file (Scientific Word)
.tex    Datasheet (Idealist)
.tf     Configuration (Turbo Profiler)
.tfa    Area file (Turbo Profiler)
.tfc    Catalogue file (Tobi's Floppy Cataloguer)
.tfh    Help file (Turbo Profiler)
.tfm    Tex Font Metric file (TeX)
.tfm    Tagged font metric file (Intellifont)
.tfs    Statistics (Turbo Profiler)
.tg1    Project file (On Target)
.tga    Truevision Targa bitmap graphics
.tgz    Compressed file archive created by TAR and GNUzip (.tar.gz)
.ths    Thesaurus dictionary (WordPerfect for Win)
.tif    Tagged Image File Format bitmap graphics (PageMaker - CorelDRAW)
.til    Fuzzy logic knowledge base (Togai InfraLogic Fuzzy-C Compiler)
.tis    Tile set (MahJongg 3.0)
.tjl    Backup file (VAXTPU editor)
.tlb    Reference table (Bubble Chamber)
.tlb    Text library (VAX)
.tlb    Type library (Visual C++)
.tlc    Compiled Tool Command Language source code (Swat)
.tlp    Project (TimeLine)
.tmf    Tagged Font Metric file (WordPerfect for Win)
.tmo    Ztg global optimizer default output file (Zortech C++)
.tmp    Temporary file
.tms    Script (Telemate)
.toc    Table Of Contents
.tos    Self-extracting file archive (Atari ST)
.tp     Configuration (Turbo Pascal)
.tp     Session-state file (Turbo Profiler)
.tp3    Template (Harvard Graphics 3.0)
.tpb    Downloadable PCL Soft font file backup (HiJaak)
.tpf    Downloadable PCL Soft font file (HiJaak)
.tph    Help file (Turbo Pascal)
.tpl    Resident units library (Turbo Pascal)
.tpl    Template (Harvard Graphics 2.0)
.tpp    Protected Mode Units (Borland Pascal 7.0)
.tpu    Turbo Pascal Unit (BGI) (Turbo Pascal)
.tpu    Command file (VAXTPU editor)
.tpw    Session-state file (Turbo Profiler for Windows)
.tpw    Turbo Pascal Unit (BGI) (Turbo Pascal for Windows)
.tpz    Compressed file archive created by TAR and GNUzip (.tar.gz)
.tr     Session-state settings (Turbo Debugger for DOS)
.tr     Man page input suitable for troff -man (cawf2.zip)
.tr2    Session-state settings (Turbo Debugger for Win32)
.trc    Debug support file (Power CTrace)
.tre    Directory tree file (PC-Tools)
.trm    Terminal settings (Windows 3.x)
.trn    Translation support file (Quattro)
.trs    Executable file (Micrografx)
.trw    Session-state settings (Turbo Debugger for Windows)
.tst    Printer test file (WordPerfect for Win)
.ttf    Truetype Font file
.tut    Tutorial
.tv     Table view settings (Paradox)
.tv1    Overflow file above insert point in Doc 1 (WordPerfect for Win)
.tv2    Overflow file above insert point in Doc 2 (WordPerfect for Win)
.tv3    Overflow file above insert point in Doc 3 (WordPerfect for Win)
.tv4    Overflow file above insert point in Doc 4 (WordPerfect for Win)
.tv5    Overflow file above insert point in Doc 5 (WordPerfect for Win)
.tv6    Overflow file above insert point in Doc 6 (WordPerfect for Win)
.tv7    Overflow file above insert point in Doc 7 (WordPerfect for Win)
.tv8    Overflow file above insert point in Doc 8 (WordPerfect for Win)
.tv9    Overflow file above insert point in Doc 9 (WordPerfect for Win)
.tvf    Table view settings (dBASE)
.txf    Compressed file archive created by TAR and FREEZE (.tar.f)
.txi    Support file (TeX)
.txt    Text file
.tym    Time Stamp (PageMaker 4)
.tz     Compressed file archive created by TAR and COMPRESS (.tar.Z)
.tzb    Compressed file archive created by TAR - COMPRESS - BTOA (.tar.Z.btoa)
.ub     Audio file (unsigned byte)
.uc2    Compressed file archive created by UltraCompressor II (uc2.zip)
.ucn    New compressed file archive created by UltraCompressor II
.udf    Filter (Photostyler)
.ue2    Encrypted file archive created by UltraCompressor II
.uhs    Universal Hint System (binary file)
.ui     Espire source code file (Geoworks UI Compiler)
.ui     User interface (Sprint)
.uif    Long prompts for windows (WordPerfect for Win)
.uih    Espire header file (Geoworks UI Compiler)
.ul     Ulaw audio file
.uld    Information about uploaded files (Procomm Plus)
.ult    Music (UltraTracker)
.umb    Backup file (MemMaker)
.uni    Unimod music module (MIKMOD)
.uni    Datafile (Forecast Pro)
.unx    Text file containing UNIX specific info
.upd    Program update info
.upd    Update data (dBASE)
.upo    Compiled update data (dBASE)
.usp    Printer font with USASCII extended character set (PageMaker)
.usr    User database file (Procomm Plus - Turbo C++ tour)
.uu     Compressed ASCII file archive created by UUDE/ENCODE
.uue    Compressed ASCII file archive created by UUENCODE (uuexe515.exe)
.uw     Audio file (unsigned word)
.v      Consistency check support file (ReaGeniX code generator)
.v      Main input file for an image (Vivid 2.0)
.val    Validity checks and referential integrity (Paradox for Windows)
.val    Values list object file (dBASE Application Generator)
.van    Animation (VistaPro)
.var    Variable file (IconAuthor)
.vbx    Visual Basic eXtension (Visual Basic)
.vc     Include file with color definitions (Vivid 2.0)
.vc     Spreatsheet (VisiCalc)
.vcf    VCard file
.vcw    Visual workbench information (MS Visual C++)
.vcx    Spreatsheet (VisiCalc Advanced)
.vda    Bitmap graphics
.vdr    Drawing (ComputerEasy Draw)
.vew    View file (Clipper 5, Lotus Approach)
.vfm    Voting Form (Voter)
.vfn    Voting Form for Customers (Voter)
.vga    Vga display driver
.vga    Vga display font
.vgd    Vga display driver (Generic CADD)
.vgr    Graphics (Ventura Publisher)
.vi     Graphics (Jovian Logic VI)
.vic    Vicar graphics
.vid    Ms-DOS Shell Monitor file (MS-DOS 5)
.vid    Bitmap graphics (YUV12C M-Motion Frame Buffer)
.vid    Screen device driver (Word)

.vif    Khoros Visualization image file (SDSC Image Tool)
.vik    Viking graphics
.vis    Vis graphics
.vm     Virtual Memory file (Geoworks)
.vmc    Virtual memory configuration (Acrobat reader)
.vmf    Font characteristics (Ventura Publisher)
.vms    Text file containing VMS specific info
.vo     Include file with object definition (Vivid 2.0)
.voc    Digitized samples (Creative Voice file)
.vof    Object folder (VZ Programmer)
.vpg    Graphics (VPGraphics)
.vrm    Overlay file (QuattroPro)
.vrp    Project (WATCOM VXRexx)
.vrs    Video Resource eg. video device driver (WordPerfect)
.vs     Include file with surface definition (Vivid 2.0)
.vsd    Diagram (Shapeware Visio)
.vsm    Simulation model (VisSim)
.vsp    Sprite (SPX)
.vss    Smartshapes file (Shapeware Visio)
.vst    Truevision Vista bitmap graphics
.vue    Animation (3D Studio)
.vue    View (dBASE IV - FoxPro)
.vw     Text file (Volkswriter)
.vwr    File viewer file (PC Tools)
.vxd    Virtual device driver (MS Windows)
.w      Word chart file (APPLAUSE)
.w30    Printer font (AST TurboLaser) (Ventura Publisher)
.w31    Startup file (Windows 3.1)
.w44    Temporary file for Sort or Index (dBASE)
.wab    Outlook File
.wad    Doom Game File
.wav    Waveform audio file (RIFF WAVE format)
.wb1    Notebook (Quattro Pro)
.wb2    Spreadsheet (Quattro Pro)
.wbf    Ms Windows Batch File (Catch)
.wbk    Document/workbook (WordPerfect for Win)
.wbt    Batch file (WinBatch)
.wcd    Macro token list (WordPerfect for Win)
.wcm    Data transmission file (MS Works)
.wcm    Macro (WordPerfect for Win)
.wcp    Product information description (WordPerfect for Win)
.wdb    Database (MS Works)
.web    Web source code file
.wfm    Form object (dBASE Form Designer)
.wfn    Font (CorelDRAW)
.wfx    Data file (Winfax)
.wg1    Worksheet (Lotus 1-2-3/G)
.wg2    Worksheet (Lotus 1-2-3 for OS/2)
.wid    Width table (Ventura Publisher)
.win    Window file (FoxPro - dBASE)
.wiz    Page wizard (MS Publisher)
.wk1    Spreadsheet (Lotus 1-2-3 version 2.x - Symphony 1.1+)
.wk3    Spreadsheet (Lotus 1-2-3 version 3.x)
.wk4    Spreadsheet (Lotus 1-2-3 version 3.4)
.wkb    Document (WordPerfect for Win)
.wke    Spreatsheet (Lotus 1-2-3 educational version)
.wkq    Spreatsheet (Quattro)
.wks    Spreadsheet (Lotus 1-2-3 version 1A - Symphony 1.0 - MS Works)
.wks    Workspace (Xlisp)
.wlk    Graphics (Virtus Walkthrough)
.wmc    Backup of startup files by Windows MathCad autoexec.wmc
.wmc    Macro file (WordPerfect for Win)
.wmc    Text file (WordMARC)
.wmf    Windows MetaFile vector graphics
.wn     Text (NeXT WriteNow)
.wnf    Outline font description (CorelDRAW native format)
.woa    Swap file (Windows 3.x)
.woc    Organization (Windows OrgChart)
.wow    Music (8 channels) (Grave Mod Player)
.wp     Text file (WordPerfect 4.2)
.wp5    Document (WordPerfect 5.x)
.wpd    Document (WordPerfect 6.0 - PFS:WindowWorks)
.wpf    Fax (WorldPort)
.wpf    Form (WordPerfect)
.wpg    Wordperfect Graphics vector graphics (DrawPerfect)
.wpk    Macros (WordPerfect for Win)
.wpm    Macros (WordPerfect)
.wps    Text document (MS Works)
.wq!    Compressed spreadsheet (Quattro Pro)
.wq1    Spreadsheet (Quattro Pro)
.wr1    Spreatsheet (Symphony 1.1 - 1.2 - 2)
.wrd    Template (Charisma)
.wri    Text file (Windows Write)
.wrk    Spreatsheet (Symphony 1.0)
.wrp    Compressed Amiga file archive created by WARP
.wrs    Windows Resource eg. printer driver (WordPerfect for Win)
.ws     Text file (WordStar 5.0-6.0)
.ws2    Text file (WordStar 2000)
.wsd    Document (WordStar)
.wsp    Workspace (Fortran PowerStation)
.wst    Text file (WordStar)
.wwb    Button bar for document window (WordPerfect for Win)
.wwk    Keyboard layout (WordPerfect for Win)
.wxp    Document (EXP for Windows)
.x      Avs X image file (SDSC Image Tool)
.x      Lex source code file
.x01    Secondary index (Paradox)
.x02    Secondary index (Paradox)
.x03    Secondary index (Paradox)
.x04    Secondary index (Paradox)
.x05    Secondary index (Paradox)
.x06    Secondary index (Paradox)
.x07    Secondary index (Paradox)
.x08    Secondary index (Paradox)
.x09    Secondary index (Paradox)
.xbm    X11 Bitmap graphics
.xfn    Printer font (Xerox 4045) (Ventura Publisher)
.xft    24 pin printer font (ChiWriter)
.xfx    Fax File (various)
.xi     Fast Tracker 2 Instrument or ScreamTracker Instrument File
.xif    Wang Image File
.xla    Xlib Archive (xlibpas2.zip)
.xla    Add-in macro sheet (MS Excel)
.xlb    Data (MS Excel)
.xlc    Chart document (MS Excel)
.xll    Excel Dynamic Link Library (MS Excel)
.xlm    Macro sheet (MS Excel)
.xls    Worksheet (MS Excel)
.xlt    Template (MS Excel)
.xlt    Translation table (Lotus 1-2-3 - Symphony - Procomm Plus)
.xlw    Workbook (MS Excel)
.xm     Music (Fast Tracker)
.xmi    Compressed eXtended MIdi music
.xnf    Standard Network File form
.xpm    X11 Pixel Map graphics
.xqt    Executable file (Waffle)
.xqt    Macro sheet (SuperCalc)
.xrf    Cross-reference file
.xtb    External translation table (LocoScript)
.xwd    X Window System window dump image graphics (SDSC Image Tool)
.xwk    Keyboard mapping (Crosstalk)
.xwp    Session (Crosstalk)
.xwp    Text file (Xerox Writer)
.xx     Compressed file ASCII archive created by XXENCODE (uuexe515.exe)
.xxe    Compressed file ASCII archive created by XXENCODE (uuexe515.exe)
.xy     Text file (XY Write)
.xy3    Text file (XYWrite III)
.xyw    Text file (XyWrite III)
.y      Yacc grammar file
.y      Compressed Amiga file archive created by YABBA
.y01    Secondary index (Paradox)
.y02    Secondary index (Paradox)
.y03    Secondary index (Paradox)
.y04    Secondary index (Paradox)
.y05    Secondary index (Paradox)
.y06    Secondary index (Paradox)
.y07    Secondary index (Paradox)
.y08    Secondary index (Paradox)
.y09    Secondary index (Paradox)
.yal    Data (Arts & Letters)
.yuv    Yuv graphics
.yz     Compressed file archive created by YAC
.z      Compressed file ASCII archive created by COMPRESS (comp430d.zip)
.z      Compressed file archive created by PACK (Unix SysV pack)
.z3     Infocom game module
.zdg    Compressed ZiffNet text document (Zview)
.zer    Data file (Zerberus)
.zgm    Graphics (Zenographics)
.zip    Compressed file archive created by PKZIP (pkz204g.exe)
.zom    Compressed Amiga file archive created by ZOOM
.zoo    Compressed file archive created by ZOO (zoo210.exe)
.zvd    Zyxel Voicefile (Z-Fax)
.~$~    Temporary file (1st Reader)
.~ap    Old AppExpert project database (Borland C++ 4.5)
.~de    Project backup (Borland C++ 4.5)
.~mn    Menu backup (Norton Commander)
.\201$\201      Temporary file (1st Reader)