No.ExtensionDescription
01.$$$ Temporary file
02.2gr A File That allows Windows to Display Text and Graphics in Standard Mode on a 286 or 386 Computer
03.386Swap File Enables Computer Running in Enhanced mode to Use Windows with Virtual Memory
04.3grA File That allows Windows to Display Text and Graphics in Enhanced Mode on a 386, 486, or Pentium Computer
05.906Calcomp Plotter
06.a3wMacromedia Authorware Windows 3.5
07.abkAutobackup, Corel Draw
08.abrBrush | Adobe Photoshop
09.aclKeyboard Accelerator, Corel Draw 6
10.acmWindows System Directory File
11.acvDrivers For Compressing or Decompressing Audio Files, OS/2
12.adAfter Dark
13.adb1.Appointment DataBase, HP 100LX.2.Body File Type, Ada Language
14.addAdapter Driver – OS/2
15.admAfterDark MultiModule
16.adrAfterDark Randomizer. AfterDark is a Screensaver Program That Can be Set to Randomly Display a Variety of Screensaver Patterns one After Another
17.adsSpecification File Type, Ada Language
18.afmAdobe Font Metrics – Type 1 Font Metrics
19.ag4Access G4
20.aiAdobe Illustrator
21.aifAudio Interchange File Format or AIFF. A Format Developed by Apple Computer For Storing High-Quality Sampled Audio and Musical Instrument Information. It can be Played on PC and Mac
22.aiffAudio Interchange File Format. An Uncompressed Sound Format Developed by Apple Computer for Storing High-Quality Sampled Audio and Musical Instrument Information. It can be Played on PC and Mac, Using QuickTime or Sound Player
23.allArts and Letters Library
24.aniAnimated Cursor
25.ansANSI Text
26.apiApplication Program Interface. An Interface Between the Operating System and Application Programs
27.appMacromedia Authorware Package
28.arcARC Compressed
29.arjA PC Compressed Format Found on European Sites, Which can be Decoded With unArjMac, DeArj, and SITEX10.EXE (win).
30.artAn art File, in Some Draw or Paint Applications
31.ascASCII Text File
32.asfActive Streaming File -Hot Metal Pro
33.asmAssembly Source Code
34.aspActive Server Page – Microsoft
35.astAssistant File – Claris Works. Assistants Guide The User Through a Task by Asking a Series of Questions and Then Use the Answers to Perform a Task. Assistants in Claris Works can be used to create Such Useful Items as Calendars, Newsletters, Stationery, Labels, and Address Lists, to Make Footnotes Within a File etc.
36.attAT & T
37.auA Sound File Format Used on Sun Microsystems or Other UNIX Computers
38.aviAVI Movie Format
39.avsIntel Video Capture Format
40.b64Base 64, The Encoding Format Used by the Multipurpose Internet Mail Extension
41.bakBackup Copy in DOS or OS/2
42.basBASIC Program File
43.batBatch
44.bfcBriefcase Document – Windows 95
45.bgBackgammon Game
46.biBinary File
47.binDriver or A MacBinary II Encoded File. This File Type, Downloaded as Macbinary or Binary, can be Decompressed with Stuffit Expander
48.bkBackup Copy
49.bk$Backup File
50.bltWordperfect For DOS
51.bmpBitmap
52.bnkSim City Game File
53.brxBrowse Index.Found on Multimedia CD-ROMs
54.btmBatch File – Norton Utilites
55.ccProgram File
56.cabMicrosoft Compressed Format
57.calCalendar or CALS
58.capCaption
59.cbtComputer-Based Training; a Tutorial File
60.cchCorel Chart
61.ccmLotus cc:Mail
62.cdaCD Audio Track
63.cdrCorelDraw
64.cdtCorel Draw Template
65.cdxCorel Draw Compressed File (File Extension)
66.cdxVisual FoxPro Database Index
67.cfbCompton’s Multimedia Encyclopedia
68.cfgConfiguration
69.cflCorel Flow
70.cgiCommon Gateway Interface. A File That Makes it Possible for HTTP Servers to Interface With Computer Programs to Provide Interactive Functions Like Fill-out Forms
71.cgmCGM Graphics
72.chkCheckdisk – DOS Command
73.chpChapter – Ventura
74.cifChapter Information – Venture
75.cimSim City File
76.citIntergraph Scanned Image
77.clpClipboard File
78.cmdCommand file – OS/2
79.cmfCorel MetaFile
80.cmfSoundBlaster File
81.cmpLEAD Technologies Graphics
82.cmvCorel Move Animation
83.cnfConfiguration File
84.cnqCompuworks Desing Shop
85.cobCOBOL Source Code
86.comCommand File – Small Version of .EXE
87cpeFax Cover document
88.cpiCode Page – DOS
89.cplControl Panel – Windows
90.cppC++ Program File
91.cprKnowledge Access graphics
92.cptCompact Pro
93.cpxCorel Presentation Exchange Compressed File
94.crdWindows Cardfile
95.cscCorel Script
96.cssCascading Style Sheet
97.csvComma Delimited
98.ctlControl File
99.ctyCity File – SimCity
100.curWindows Cursor Image
101.cutDr. Halo Graphics
102.cvMicrosoft CodeView
103.cwkClaris Works
104.cwsClaris Works Template
105.datData
106.dbTable – Paradox
107.dbcVisual Foxpro Database
108.dbfDatabase File – dBASE
109.dbtDatabase Text – dBASE
110.dbxDATABEAM Graphics
111.dcaIBM Text
112.dcsColor Separation – EPS
113.dctDictionary
114.ddDisk Doubler
115.ddiDisk Doubler Image
116.defDefinition – C++
117.derCertificate
118.devDevice Driver File
119.dgAutotrol Graphics
120.dgnIntergraph Graphics
121.dibDIB Graphics – Windows
122.dicDictionary
123.difData Interchange Format Spreadsheet
124.dllDynamic Link Library
125.docDocument File
126.dotDocument Template – Microsoft Word
127.doxMultiMate Document
128.dpiDots Per Inch – Graphics
129.dprDelphi Project File
130.drvDriver
131.drwDesinger Graphics
132.ds4Desinger Graphics, Version 4
133.dsfDesinger Graphics, Version 6
134.dwgAutoCAD Vector Format
135.dwgDrawing – AutoCAD
136.dxDocument Imaging
137.dxfAutoCAD Vector Format
138.ed5EDMICS Graphics
139.emfEnhanced Windows Metafile
140.emlElectronic Mail
141encEncoded
142.epsEncapsulated PostScript Format
143.esiEsri Plot File
144.exeExecutable File – Machine code
145.faxFax
146.fdxForce Index
147.fh3Aldus Freehand 3
148.flcAutoDesk Animation
149.fldThumbnail Folder – Hijaak
150.fliAutoDesk Animation
151.flrLive3D
152.fltFilter – Graphics Conversion
153.fmFramemaker
154.fm3Format for 1-2-3 Version 3
155.fmtFormat – dBASE
156.fntFont
157.fogFontographer font
158.fonBitmapped Font – Windows
159.forFORTRAN
160.fotWindows TrueType Font
161.foxFoxBase
162.fpClaris FileMaker Pro
163.fp1Flying Pigs
164.fp3Filemaker Pro 3
165.fpxFlashPix Bitmap
166.frmForm Desing – Visual Basic
167.frsWordPerfect Graphics Driver
168.g4GTX RasterCAD
169.gcaGOCA Graphics
170.gedArts & Letters Graphics
171.gemGEM Graphics
172.geoVideoScope
173.gifGraphics Interchange Format
174.glyGlossary
175.gp3CCITT Compressed Group 3 TIFF File
176.gp4Group 4 – CALS,ITU.CCITT Compressed Group 4 TIFF File
177.graMicrosoft Graph
178.grfGraph
179.grpGroup
180.gx1Show Partner Graphics
181.gx2Show Partner Graphics
182.gzGNU Gzip Compressed File – Unix
183.hHierarchical Data File
184.hdfHierarchical Data File
185.hedHighEdit document
186.helMicrosoft Hellbender Game File
187.hglHP Graphics Language
188.hlPHelp
189.hpjHelp Project – Visual Basic
190.hplHP Graphics
191.hqxBinHex (File Name Extension – Macintosh)
192.hstHost
193.htHyperTerminal
194.htmDOS File Name Extension For a Document With HTML Coding, Which Can be Read by WWW Browsers
195.htmFile Name Extension For a Document With HTML Coding, Which Can be Read by WWW Browsers
196.hwpHangul Word Processor
197.hycHyphenation – WordPerfect
198.hypHyphenation
199.icaIOCA Graphics
200.icbTarga Bitmap
201.icmImage Colour Matching
202.icoIcon – Windows or OS/2
203.iconSun Icon and Cursor
204.iddInstrument Definition – MIDI
205.ideIntegrated Development Environment Configuration
206.idxIndex
207.iffAmiga
208.igfInset Systems graphics – Hijaak
209.iifInterchange File – QuickBooks for Windows
210.ilIcon Library
211.imaWinimage Compressed Format These Files Can be Decoded or Mounted by ShrinkWrap
212.imageMac Disk Image; a Compressed Format Which Can be Decoded or Mounted by DiskCopy, Disk Image Mounter Disk Charmer, and ShrinkWrap (ImageMaster)
213.imgThis File is a Macintosh Disk Image. Disk Copy Can be Used to Mount The Disk Image on The Macintosh Desktop. The Mounted Disk Image Will Behave Like a Read-Only Disk
214.indIndex
215.infInformation
216.iniInitialization – Configuration Settings
217.iobImagine File
218.isuNetscape File
219.itMOD Music File Format
220.iwIdlewild Screensaver
221.ixIndex File – Framemaker
222.jffJPEG File Interchange Format; a 24-bit Graphic Format. It Can be Opened With QuickTime, a WWW Browser, or a Graphics Viewer Such as JPEGView
223.jifJPEG Image Format
224.jpegJPEG Bitmap
225.jpgFile Extension for JPEG (Joint Photographic Experts Group). A File Stored in JPEG Format. JPEG,an ISO/ITU Standard For Storing Images With High Compression Capability, Uses a Discreet Cosine Transform That can Achieve Compression Rates of 100:1 (singificant Loss of Data From Original) and 20:1 (Minimal Loss). C-Cube Microsystems Introduced The First JPEG Chip
226.jtJT Fax
227.jtfJPEG Bitmap
228.kdcKodak Photo-Enhancer
229.kfxKofax
230.lblLabel – dBASE
231.lbmDeluxe Paint Graphics File
232.ldbLock File – Microsoft Access
233.legLegacy Document
234.lhaFile Name Extension for a PC/Amiga Compression Format Decodable by LHA Expander or MacLHA
235.lhsLiterate Haskell Source File
236.lhzLHA Compression File
237.libLibrary
238.licLicense File – Shareware
239.logLog
240.lstList
241.lwpLotus Word Pro Document
242.lzhLHARC Compression
243.lzsPC/Amiga compression format
244.m3dMotion 3D – Corel
245.macMacPaint
246.mafMicrosoft Access Form
247.makMakefile
248.mamMicrosoft Access Macro
249.mapMap – Linkage Editor
250.maqMicrosoft Access Query
251.marMicrosoft Access Report
252.matMicrosoft Access Table
253.mcsMathCAD Format
254.mcwMicrosoft Word for Macintosh
255.mdbAccess Database
256.mdxMulti-Index
257.metMetafile – OS/2
258.meuMenu
259.mffMIDI File Format
260.mgfMicrografx Draw Font
261.miMiscellaneous
262.micMicrosoft Image Composer
263.midMIDI File
264.miffAn ImageMagick file format
265.milGroup 4 File
266.mimeMIME; The Encoding Format used by the Multipurpose Internet Mail Extension
267.mmeMime Encoded File; The Encoding Format Used by the Multipurpose Internet Mail Extension
268.mmfMicrosoft Mail File
269.mmmMacromind Animation
270.mod(For Module) – A Music File Format That Contains Digitized Sound Samples A .MOD File Takes More Memory Than a MIDI File Because a MIDI File Contains Instructions for Making Sounds But not The Actual Sound Samples. There are .MOD Players For Amiga, PC, and Macintosh Computers
271.movMovie – QuickTime
272.movieQuickTime Movie – This File Can be Viewed With QuickTime Player
273.mozMozilla – Netscape Cache file
274.mp2MPEG Layer II Compressed Audio. This file Can be Played Using QuickTime Player and Some Other Sound Players
275.mp3MPEG Layer III Compressed Audio. This File can be Played With QuickTime Player, Real Player, and Some Other Sound Players
276.mpeMPEG
277.mpegMPEG Movie or Animation File. This File Can be Played with QuickTime Player
278.mpgMPEG Encoded File. This File is an MPEG Movie, and Can be Played With QuickTime Player
279.mpntMacintosh MacPaint
280.mppMicrosoft Project project file
281.mptMicrosoft Project Template File
282.mpxMicrosoft Project Export File
283.mrkMarkup – Informative Graphics
284.msgMessage File
285.msnMicrosoft Network Document
286.mspMicrosoft Paint
287.musMusic
288.mvbMicrosoft Multimedia Viewer
289.mysMyst Saved Game File
290.ndxIndex – dBASE
291.netNetwork File
292.ngNorton Guides
293.nlmNLM program – NetWare
294.ntfNotes Template File – Lotus Notes Database
295.oabOutlook Address Book – Microsoft
296.oazOAZ Fax
297.obdMicrosoft Office Binder
298.objObject module
299.ocxObject Linking and Embedding (OLE) Custom Control
300.olbOLE Object Library
301.oleOLE object
302.onxOnyx Graphics Postershop
303.oriOriginal
304.ovlOverlay Module
305.ovrOverlay Module
306.ozmSharp Organizer Memo Bank
307.ozpSharp Organizer Telephone Bank
308.p10Tektronix Plot10
309.pabPersonal Address Book – Microsoft
310.pakQuake Dame Data
311.palPaintbrush Palette
312.pasPascal Program File
313.patPattern – Corel Draw
314.pbkMicrosoft Phonebook
315.pbmPortable Bit Map
316.pcdPhoto CD Format
317.pclHP LaserJet
318.pcmLaserJet cartridge information
319.pcsPICS Animation
320.pctPC Paint
321.pcwPC Write
322.pcx1.PC Paintbrush2. Graphics file – Zsoft Format
323.pdgPrintShop Deluxev
324.pdvPC Paintbrush Printer Driver
325.pfaType 1 Font – ASCII
326.pfbType 1 Font – Encrypted
327.pfmPostscript Font Metrics,Windows Type 1 Font Metrics
328.pgmPortable Gray Map Bitmap
329.phtmlHTML Document With Preprocessing Instructions (PPIs)
330.picPICT Graphics Format, or PIXAR Picture File
331.pictMacintosh QuickDraw/PICT This Kind of File Stores Images in QuickDraw Vector Format. PICT2 Can Have Grayscale Bitmapped Images Also
332.pifProgram Information File – Windows
333.pitPackIt – Macintosh Compression
334.pixInset Systems Graphics
335.pjxProject File – Visual FoxPro
336.pkgAppleLink Package Compression Format These Files are Decodable by StuffIt Expander
337.plPerl Script
338.pltPlotter Drawing
339.pmPagemaker
340.pm3Pagemaker 3 Document
341.pm4Pagemaker 4 Document
342.pm5Pagemaker 5 Document
343.png1.Portable Network Graphics Bitmap2.Paint Shop Pro Browser
344.povPersistence Of Vision Raytracer
345.ppaPowerPoint Add-in – Microsoft
346.ppdPostScript Printer Description
347.ppmPortable Pixelmap
348.ppsPowerPoint Slideshow
349.pptPowerPoint Presentation
350.prdPrinter Driver – Microsoft Word, Word Perfect, Microsoft Works
351.prgA dBASE Source Code File
352.prjProject File
353.prn1.Print File – Temporary2.Xywrite Printer Driver3.Post Script File.
354.prsWord Perfect Printer Driver
355.prtFormatted Text
356.psPostScript. This is a Plain Text File
357.psdPhotoshop Document
358.pubPublication – Ventura Publisher,Microsoft Publisher
359.pwdPocket Word Document – Microsoft
360.pwzMicrosoft PowerPoint Wizard
361.pxlMicrosoft Pocket Excel
362.qbwQuickBooks for Windows
363.qdkQuarterdeck Qemm
364.qlbQuick Library
365.qlcATM Font Information
366.qryMicrosoft Query
367.qtQuickTime Movie, Binary File Type
368.qtmQuickTime Movie
369.r8lLaserJet Landscape Font
370.r8pLaserJet Portrait Font
371.raRealAudio
372.ramReal Audio
373.rasRaster Graphics – Sun
374.rawRaw File Format – Bitmap
375.rcA File Name Extension Found in Many UNIX Files (.newsrc, etc.) Which Means “Run Commands”
376.recWindows Recorder Macro File
377.regRegistration File
378.repReport File
379.rftRFT-DCA
380.rgbAn SGI RGB Image File
381.riaAlpharel Group IV Raster Graphics
382.ribRenderman Graphics
383.ricRoch FaxNet
384.rifFractal Painter Bitmap
385.riffResource Interchange File Format A Multimedia File Format; the Microsoft Equivalent to Amiga IFF Format
386.rixRIX Virtual Screen
387.rlaWavefront Raster Image
388.rlcCAD Overlay ESP – Image Systems
389.rleRun Length Encoded
390.rmReal Media
391.rmiRIFF MIDI File
392.rndAutoShade Format
393.rnlGTX Runlength Raster Graphics
394.rptReport file
395.rtfMicrosoft Text and Graphics
396.sAssembly Language File – Unix
397.s3mMOD Music File
398.samAmiPro
399.savSaved Game
400.sbpIBM Storyboard Graphics / Superbase Text
401.scSource Code – Paradox
402.scmScreenCam Movie
403.scpDial-up Networking Script
404.scr1.Screensaver – Windows.2.Screen Layout – dBASE.3.Script For Apple’s Disk Copy Utility
405.sctScreen Capture Text – Lotus
406.sdlSmartDraw Library
407.seaSelf-Extracting Archive (Stuffit or Compact Pro)
408.segSegment (of a Compressed File Saved in Segments With Stuffit or Compact Pro)
409.sepTIFF Bitmap
410.setSetup Parameters
411.sflLaserJet Landscape Font
412.sfpLaserJet Portrait Font
413.sfsPCL 5 Scalable Font
414.sharUNIX Shell Archive, Which Can be Decoded by Unshar
415.shtmlHTML File With Embedded Server-side Includes (SSIs)
416.siSoftImage Image File
417.sigsingature A .sig File Can be Set up and Automatically Attached to Outgoing Email, Newsgroup Postings, etc. It Includes The Name and Contact Information of The Sender, and May also Have ASCII art, Favorite Quotes, etc
418.sitStuffit Compressed File
419.sldAutoCAD Slide
420.slkSymbolic Link (SYLK) Spreadsheet
421.smiSelf-Mounting Image. This file is a Macintosh Disk Image, Similar to an .img File, But it Does Not Require The Use of Disk Copy. When The File is Downloaded, a Disk Image Appears on The Desktop. The Disk Image Will Behave Like a Read-Only Disk
422.sndSound File
423.snmNetscape Mail
424.spdSpeedo Scalable Font
425.spxScreen Peace Extension
426.sqbSyQuest Backup
427.srcA File Used in The Creation of .INI Files For Configuration Settings
428.styStyle sheet – Ventura
429.svxAmiga 8SVX Sound
430.swpSwap – Temporary File
431.sydSysedit Backup File
432.sylSYLK Spreadsheet Format
433.synuSDSC Synu Image
434.sysSystem File
435.talAdobe Type Align
436.tarTar – Tape ARchive. Tar is a UNIX Method of Archiving Files, Which can Also be Used by PCs. Tar Archives Files but Does not Compress Them, so Sometimes .tar Files are Compressed With Other Utilities, Which Produces Extensions like .tar.gz, .tar.Z, and .tgz. Archive Files With The .tar Extension Can be Extracted in UNIX With Tar or on a PC with Winzip or on The Mac With The Program Tar
437.tar.gzOmbined File Name Extension For a File That Has Been Archived Using tar and Then Gzipped
438.tar.zCombined File Name Extension for a File That has Been Archived Using tar and Then Zipped
439.tazAnother Way of Writing .tar.Z
440.tbkAsymetrix Toolbook
441.tdfTypeface Definition – Speedov
442.texTex or LaTex Document
443.tfmFont Metrics – Intellifont
444.tgaTARGA Graphics
445.tgzAnother Name For .tar.z and .tar.gz
446.themeDesktop Theme – Windows 95
447.thnThumbnail
448.tifTIFF Graphics File
449.tiffTIFF Graphics File
450.tlbOLE Type Library
451.tmpTemporary File
452.tocTable Of Contents
453.trmTerminal Settings – Windows
454.ttcTrueType Compressed Font
455.ttfrueType Font
456.twfTabWorks File (File Extension)
457.tx8MS-DOS Text
458.txtASCII Text File
459.uslLaserJet Landscape Font
460.uspLaserJet Portrait Font
461.uuUuencode Compressed File
462.uueUuencode File
463.vbpVisual Basic Project
464.vbxVisual Basic Extension
465.vdaTarga Bitmap
466.vgrVentura
467.viffKhoros Visualization Image File
468.vlbVentura Library
469.vocSound Blaster
470.vpVentura Publisher
471.vstTarga Bitmap
472.vueRelational View – dBASE
473.vxdVirtual Device Driver
474.wabWindows Address Book
475.wavSound File
476.wbkMicrosoft Word Backup
477.wdbMicrosoft Works Database
478.widVentura Width Table
479.winWindows Backup File
480.wizMicrosoft Word Wizard
481.wk1Lotus 1-2-3, up to 2.01
482.wk3Lotus Version 3
483.wk4Lotus Version 4
484.wkqQuattro Spreadsheet
485.wks1.Lotus Worksheet.2.Microsoft Works document
486.wlrVRML Page
487.wmfWindows Metafile
488.wpWordPerfect
489.wpd1.Windows Printer Description.2.WordPerfect Demo.3.WordPerfect Document
490.wpgWordPerfect Graphics
491.wpmWordPerfect Macro
492.wpsMicrosoft Works Document
493.wptWordPerfect Template
494.wriWindows Write Document
495.wrkSymphony Spreadsheet
496.ws1WordStar For Windows 1 Document
497.ws2WordStar For Windows 2 Document
498.ws3WordStar For Windows 3 Document
499.ws4WordStar For Windows 4 Document
500.ws5WordStar For Windows 5 Document
501.ws6WordStar For Windows 6 Document
502.ws7WordStar For Windows 7 Document
503.wvlWavelet Compressed Bitmap
504.xAVS X Image File
505.xarCorel Xara Drawing
506.xbmX Bitmap
507.xfxJetFax
508.xifXerox Image Format
509.xlcExcel Chart
510.xlkMicrosoft Excel Backup
511.xlmMicrosoft Excel Macro
512.xlsExcel Worksheet
513.xltMicrosoft Excel Template
514.xmMOD Music Format
515.xpmX Pixelmap
516.xwdX Window System Window Dump Image
517.xxeXxencoded File
518.yalArts & Letters Click art
519.zUnix compress File
520.zipFile Compressed Using PKZIP
521.zooZoo

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