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Computer File Extentions

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A
.ABK Corel Draw AutoBackup
.ACL Corel Draw 6 keyboard accelerator
.ACM Used by Windows in the system directory
.ACP Microsoft Office Assistant Preview file
.ACT Microsoft Office Assistant Actor file
.ACV OS/2 drivers that compress and decompress audio data
.AD After Dark screensaver
.ADB Appointment database used by HP 100LX organizer
.ADD OS/2 adapter drivers used in the boot process
.ADM After Dark MultiModule screensaver
.ADP Used by FaxWorks to do setup for fax modem interaction
.ADR After Dark Randomizer screensaver
.AFM Adobe font metrics
.AF2 ABC Flowchart file
.AF3 ABC Flowchart file
.AI Adobe Illustrator drawing
.AIF Apple Mac AIFF sound
.ALB JASC Image Commander album
.ALL Arts & Letters Library
.AMS Velvert Studio music module (MOD) file
.ANC Canon Computer Pattern Maker file that is a selectable list of pattern colors
.ANI Animated Cursor
.ANS ANSI text
.API Application Program Interface file; used by Adobe Acrobat
.APR Lotus Approach 97 file
.APS Microsoft Visual C++ file
.ARC LH ARC (old version) compressed archive
.ARJ Robert Jung ARJ compressed archive
.ART Xara Studio drawing
.ART Canon Crayola art file
.ASA Microsoft Visual InterDev file
.ASC ASCII text
.ASD WinWord AutoSave
.ASM Assembler language source file
.ASP Active Server Page (an HTML file containing a Microsoft server-processed script)
.ASP Procomm Plus setup and connection script
.AST Claris Works "assistant" file
.ATT AT&T Group 4 bitmap
.AVI Microsoft Video for Windows movie
.AWD FaxView document

B
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.BAK Backup file
.BAS BASIC code
.BAT Batch file
.BFC Windows 95 Briefcase document
.BG Backgammon for Windows game
.BI Binary file
.BIF GroupWise initialization file
.BIN Binary file
.BK Sometimes used to denote backup versions
.BK$ Also sometimes used to denote backup versions
.BKS An IBM BookManager Read bookshelf
.BMK An A bookmark file
.BMP Windows or OS/2 bitmap
.BM1 Apogee BioMenace data file
.BRX A file for browsing an index of multimedia options 
.BSP Quake map
.BS1 Apogee Blake Stone data file
.BTM Batch file used by Norton Utilities
.B4 Helix Nuts and Bolts file

C
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.C C code
.CAB Microsoft cabinet file (program files compressed for software distribution)
.CAL CALS Compressed Bitmap
.CAL Calendar schedule data
.CAS Comma-delimited ASCII file
.CAT IntelliCharge categorization file used by Quicken
.CB Microsoft clean boot file
.CCB Visual Basic Animated Button configuration
.CCF Multimedia Viewer configuration file used in OS/2
CCH
 Corel Chart
.CCM Lotus CC:Mail "box" (for example, INBOX.CCM)
.CDA CD Audio Track
.CDF Microsoft Channel Definition Format file
.CDI Phillips Compact Disk Interactive format
.CDR Core Draw drawing
.CDT Corel Draw template
.CDX Corel Draw compressed drawing
.CEL CIMFast Event Language file
.CFB Comptons Multimedia file
.CFG Configuration file
.CGI Common Gateway Interface script file
.CGM Computer Graphics Metafile
.CH OS/2 configuration file
.CHK File fragments saved by Windows Disk Defragmenter or ScanDisk
.CHP Ventura Publisher chapter
.CIL Clip Gallery download package
.CIM Sim City 200 file
.CIN OS/2 change control file that tracks changes to an INI file
.CK1 iD/Apogee Commander Keen 1 data file
.CK2 iD/Apogee Commander Keen 2 data file
.CK3 iD/Apogee Commander Keen 3 data file
.CK4 iD/Apogee Commander Keen 4 data file
.CK5 iD/Apogee Commander Keen 5 data file
.CK6 iD/Apogee Commander Keen 6 data file
.CLASS Java class
.CLP Windows Clipboard file
.CLS Visual Basic Class Module
.CMD Command file for Windows NT (similar to a DOS .BAT file)
.CMD DOS CP/M command file
.CMD dBase-II program file
.CMF Corel Metafile
.CMP JPEG Bitmap
.CMP Address document
.CMV Corel Move animation
.CMX Corel Presentation Exchange image
.CNF Configuration file used by Telnet, Windows, and other applications
.CNM Windows application menu options and setup file
.CNQ Compuworks Design Shop file
.CNT Windows (or other) system content files for the help index and other purposes
.COB trueSpace2 object
.COD Microsoft C compiler output as displayable assembler with original C as comments
.COM Command file (program)
.CPD Fax Cover document
.CPE Fax Cover document
.CPI Microsoft MS-DOS code page information file
.CPL Control Panel extension
.CPL Corel colour palette
.CPP C++ code
.CPR Corel Presents Presentation
.CPT Corel Photo-Paint image
.CPX Corel Presentation Exchange Compressed drawing
.CRD Cardfile file
.CRP Corel Presents Run-Time Presentation
.CRT Certificate file
.CSC Corel Script
.CSP PC Emcee On-Screen image
.CSV Comma-separated values file
.CT Scitex CT Bitmap
.CTL Used in general to mean a file containing control information. 
.CUE Microsoft Cue Cards data
.CUR Windows Cursor
.CUT Dr Halo bitmap
.CV Corel Versions archive
.CV Microsoft CodeView information screen
.CWK Claris Works data file
.CWS Claris Works template
.CXX C++ source code file

D
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.DAT Data file
.DAT WordPerfect Merge Data
.DBF Aston-Tate dBASE database
.DBX DataBeam image
.DCR Shockwave file
.DCS Desktop Color Separation file
.DCX Fax image (based on PCX)
.DDF BTRIEVE database
.DEF SmartWare II data file
.DEF C++ Definition
.DER Certificate file
.DIB Device-Independent Bitmap
.DIC Dictionary
.DIF Data Interchange Format spreadsheet
.DIR Macromedia Director file
.DIZ Description file
.DLG C++ Dialogue Script
.DLL Dynamic-Link Library
.DMF X-Trakker music module (MOD) file
.DOC FrameMaker or FrameBuilder document
.DOC WordStar document
.DOC WordPerfect document
.DOC Microsoft Word document
.DOT Microsoft Word document Template
.DPR Borland Delphi project header file
.DRV Driver
.DRW Micrografx Designer/Draw
.DSG DooM saved game
.DSM Dynamic Studio music module (MOD) file
.DSP Microsoft Developer Studio project
.DSQ Corel QUERY file
.DSW Microsoft Developer Studio workspace
.DWG AutoCAD drawing eXchange format
.DXF AutoDesk Drawing Interchange format

E
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.EMF Enhanced Windows Metafile
.ENC Encore file
.EPS Encapsulated PostScript image
.ER1 ERWin file
.ERX ERWin file
.EVY Envoy document
.EWL Microsoft Encarta document
.EXE Executable file (program)

F
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.F FORTRAN file
.F77 FORTRAN file
.F90 FORTRAN file
.FAR Farandole Composer music module (MOD) file
.FAV Microsoft Outlook navigation bar
.FAX FAX Type image
.FH3 Aldus Freehand 3 drawing
.FIF Fractal image file
.FITS CCD camera image
.FLC AutoDesk FLIC animation
.FLI AutoDesk FLIC animation
.FLT Corel filter
.FLT StarTrekker music module (MOD) file
.FMB Oracle binary source code for form, version 4.0 and later
.FMT Oracle text format of form, version 4.0 and later
.FMT Microsoft Schedule+ print file
.FMX Oracle executable form, version 4.0 and later
.FOG Fontographer font
.FON System font
.FOR FORTRAN file
.FOT Font-related file
.FP FileMaker Pro file
.FP1 Flying Pigs for Windows data file
.FP3 FileMaker Pro file
.FPX FlashPix bitmap
.FRM Form
.FRM FrameMaker or FrameBuilder document
.FRM Oracle executable form version 3.0 and earlier
.FRM Visual Basic form
.FRM WordPerfect Merge form
.FRX Visual Basic form stash file

G
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.GAL Corel Multimedia Manager album
.GCP Ground Control Point file used in image processing of remote sensing data . 
.GED Graphic Environment Document (drawing)
.GEM GEM metafile
.GEN Ventura-Generated text file
.GFC Patton&Patton Flowcharting 4 flowchart file
.GFI Genigraphics Graphics Link presentation
.GFX Genigraphics Graphics Link presentation
.GID Windows 95 global index file (containing help status)
.GIF CompuServe bitmap
.GIM Genigraphics Graphics Link presentation
.GIX Genigraphics Graphics Link presentation
.GNA Genigraphics Graphics Link presentation
.GNX Genigraphics Graphics Link presentation
.GRA Microsoft Graph
.GRD Grid file, used in image processing of remote sensing data often to form map projections. 
.GRP Program Manager Group
.GTK Graoumftracker (old) music module (MOD) file
.GT2 Graoumftracker (new) music module (MOD) file
.GWX Genigraphics Graphics Link presentation
.GWZ Genigraphics Graphics Link presentation
.GZ Unix Gzip compressed file

H
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.H C program header
.HED HighEdit document
.HEL Microsoft Hellbender saved game
.HEX Macintosh BinHex 2.0 file
.HGL HP Graphics Language drawing
.HLP Help file
.HOG Lucas Arts Dark Forces WAD file
.HPJ Visual Basic Help Project
.HPP C++ program header
.HQX Macintosh BinHex 4.0 file
.HST History file
.HT HyperTerminal
.HTM Hypertext document
.HTML Hypertext document
.HTX Extended HTML template

I
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.ICA Citrix file
.ICB Targa bitmap
.ICM Image Color Matching profile file
.ICO Windows Icon
.IDD MIDI Instrument Definition
.IDQ Internet Data Query file
.IFF Amiga ILBM
.IGF Inset Systems metafile
.IIF QuickBooks for Windows interchange file
.IMA WinImage file
.IMG GEM image
.INC Assembler language or Active Server include file
.INF Information file
.INI Initialization file
.INP Oracle source code for form, version 3.0 and earlier
.INS InstallShield install script
.INS X-Internet sign-up file
.ISO Lists the files on a CD-ROM; based on the ISO 9660 CD-ROM file system standard
.ISP X-Internet sign-up file
.ISU InstallShield uninstall script
.IT Impulse Tracker music module (MOD) file
.IW Idlewild screensaver

J
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.JAR Java ARchive file (a compressed file for applets and related files)
.JAVA Java source code
.JBF Paint Shop Pro image browser file
.JFF JPEG bitmap
.JIF JPEG bitmap
.JMP SAS JMPDiscovery chart-to-statistics file
.JN1 Epic MegaGames Jill of the Jungle data file
.JPEG JPEG bitmap
.JPG JPEG bitmap
.JS JavaScript source code
.JTF JPEG bitmap

K
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.KDC Kodak Photo-Enhancer
.KFX KoFax Group 4 image
.KYE Kye game data

L
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.LBM Deluxe Paint bitmap
.LDB Microsoft Access lock file
.LEG Legacy document
.LHA Alternate file suffix for LZH
.LIB Library
.LIS Output file produced by a Structured Query Reporting (SQR) program
.LOG Log file
.LPD Helix Nuts and Bolts file
.LRC Intel Video Phone file
.LST List file
.LWO Lightwave Object file
.LWP Lotus Wordpro 96/97 file
.LZH LH ARC compressed archive
.LZS Skyroads data file

M
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.M3D Corel Motion 3D animation
.MAC MacPaint image
.MAD Microsoft Access module
.MAF Microsoft Access Form
.MAK Visual Basic or MS Visual C++ Project
.MAM Microsoft Access Macro
.MAP Map file
.MAP Duke Nukem 3D WAD game file
.MAQ Microsoft Access Query
.MAR Microsoft Access Report
.MAS Lotus Freelance Graphics Smartmaster file
.MAT Microsoft Access Table
.MAX Paperport file
.MAZ Hover maze data
.MB1 Apogee Monster Bash data file
.MCC Dialer10 calling card
.MCS MathCAD image
.MCW Microsoft Word for Macintosh document
.MDA Microsoft Access add-in
.MDB Microsoft Access database
.MDE Microsoft Access MDE file
.MDL Digital Tracker music module (MOD) file
.MDL Quake model file
.MDN Microsoft Access blank database template
.MDW Microsoft Access Workgroup
.MDZ Microsoft Access wizard template
.MED Music Editor, OctaMED music module (MOD) file
.MER Format for interchanging spreadsheet/database data; recognized by Filemaker, Excel, and others
.MET Presentation Manager metafile
.MI Miscellaneous
.MIC Microsoft Image Composer file
.MID MIDI music
.MMF Microsoft Mail File
.MMM Microsoft Multimedia Movie
.MOD FastTracker, StarTrekker, Noise Tracker (etc.) music module file
.MOD Microsoft Multiplan spreadsheet
.MOV QuickTime for Windows movie
.MPE MPEG animation
.MPEG MPEG animation
.MPG MPEG animation
.MPP Microsoft Project file
.MPP CAD drawing file format
.MP3 MPEG Audio Layer 3 (AC3) file
.MSG Microsoft Mail message
.MSN Microsoft Network document
.MSP Microsoft Paint bitmap
.MTM MultiTracker music module (MOD) file
.MUS Music
.MVB Microsoft Multimedia Viewer file
.MWP Lotus Wordpro 97 Smartmaster file

N
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.NAP NAP Metafile
.NCB Microsoft Developer Studio file
.NSF Lotus Notes database
.NST Noise Tracker music module (MOD) file
.NTF Lotus Notes database template

O
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.OBD Microsoft Office binder template
.OBD Microsoft Office Binder
.OBJ Object file
.OBZ Microsoft Office Binder Wizard
.OCX Microsoft Object Linking and Embedding custom control
.OFN Microsoft Office FileNew file
.OFT Microsoft Outlook template
.OKT Oktalyzer music module (MOD) file
.OLB OLE Object Library
.OLE OLE object
.OPT Microsoft Developer Studio file
.ORG Lotus Organiser file
.OR2 Lotus Organiser 2 file
.OR3 Lotus Organiser 97 file

P
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.P10 Tektronix Plot 10 drawing
.PAB Microsoft Personal Address Book
.PAK Quake WAD file
.PAL Windows colour palette
.PAT Corel Draw pattern
.PBK Microsoft Phonebook
.PBM Portable Bitmap
.PCD Kodak Photo-CD image
.PCL HP Laserjet bitmap
.PCS PICS animation
.PCT Macintosh PICT drawing
.PCX ZSoft PC Paintbrush bitmap
.PDF Adobe Acrobat Portable Document Format or Netware Printer Definition File
.PDF Package Definition File from Microsoft Systems Management Server
.PDQ Patton&Patton Flowcharting PDQ Lite file
.PFA Type 1 font (ASCII)
.PFB Type 1 font (binary)
.PFC PF Component
.PFM Printer Font Metrics
.PGL HP Plotter drawing
.PGM Portable Graymap (bitmap)
.PIC PC Paint bitmap
.PIC Lotus picture
.PIC Macintosh PICT drawing
.PIF Program Information File
.PIF IBM PIF drawing
.PIG Lucas Arts Dark Forces WAD file
.PIN Epic Pinball data file
.PIN Epic Pinball data file
.PIX Inset Systems bitmap
.PJ MKS Source Integrity file
.PKG Microsoft Developer Studio application extension (similar to a DLL file)
.PL Perl program
.PLT HPGL Plotter drawing
.PLT AutoCAD Plot drawing
.PM5 Pagemaker 5.0 file
.PM6 Pagemaker 6.0 file
.P65 Pagemaker 6.5 file
.PNG Portable Network Graphics bitmap
.PNG Paint Shop Pro Browser catalogue
.PNT MacPaint graphic file
.POT Microsoft PowerPoint Template
.PP4 Picture Publisher 4 bitmap
.PPA Microsoft PowerPoint Add-in
.PPM Portable Pixelmap bitmap
.PPS Microsoft PowerPoint slide show
.PPT Microsoft PowerPoint presentation
.PRE Lotus Freelance presentation
.PRF Windows system file
.PRN Print Table (space delimited text)
.PRS Harvard Graphics for Windows presentation
.PRZ Lotus Freelance Graphics 97 file
.PS Postscript Interpreted drawing
.PSD Adobe Photoshop bitmap
.PST Microsoft Outlook Personal Folder File
.PTM Polytracker music module (MOD) file
.PUB Ventura Publisher publication
.PUB Microsoft Publisher document
.PWD Microsoft Pocket Word document
.PWZ Microsoft PowerPoint Wizard
.PXL Microsoft Pocket Excel spreadsheet

Q
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.QAD PF QuickArt Document
.QBW QuickBooks for Windows file
.QDT Quick Books data file from the Quicken UK Accountancy/Tax/Invoice program
.QLB Quick Library
.QRY Microsoft Query
.QT QuickTime Movie
.QTM QuickTime Movie
.QXD Quark XPress file

R
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.R Pegasus Mail resource file
.RA Real Audio sound
.RAM Real Audio sound
.RAS Sun Raster Images bitmap
.RAW Raw File Format (bitmap)
.RC Microsoft Visual C++ Resource Script
.REC Recorder macro
.REG Registration file
.RES Microsoft Visual C++ Resource
.RFT RFT-DCA
.RLE Run-Length Encoded bitmap
.RM Real Audio video file
.RMI MIDI music
.ROV Rescue Rover data file
.RPT Microsoft Visual Basic Crystal Reports file
.RTF Rich Text Format document
.RTM Real Tracker music module (MOD) file

S
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.SAM Ami Professional document
.SAV Saved game file
.SCC Microsoft Source Safe file
.SCD Matrix/Imapro SCODL slide image
.SCD Microsoft Schedule+ 7
.SCH Microsoft Schedule+ 1
.SCN trueSpace2 scene
.SCP Dial-Up Networking Script
.SCR Windows screensaver
.SCR Fax image
.SCT Scitex CT bitmap
.SC2 Microsoft Schedule+ 7
.SDL SmartDraw library
.SDR SmartDraw drawing
.SDT SmartDraw template
.SEA Self-expanding archive (used by Stuffit for Mac files and possibly by others)
.SEP Tagged Image File Format (TIFF) bitmap
.SHB Corel Show presentation
.SHB Document shortcut file
.SHG Hotspot bitmap
.SHS Shell scrap file
.SHW Corel Show presentation
.SIT Stuffit archive of Mac files
.SLK Symbolic Link (SYLK) spreadsheet
.SND NeXT sound
.SND Mac Sound Resource
.SQC Structured Query Language (SQR) common code file
.SQR Structured Query Language (SQR) program file
.STM Scream Tracker music module (MOD) file
.STY Ventura Publisher style sheet
.SVX Amiga 8SVX sound
.SWF MS Visual Studio
.SYS System file
.S3M Scream Tracker 3 music module (MOD) file

T
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.TAR Tape Archive
.TAZ Unix Gzip/Tape Archive
.TEX Texture file
.TGA Targa bitmap
.TGZ Unix Gzip/Tape Archive
.THEME Windows 95 Desktop Theme
.THN Graphics Workshop for Windows thumbnail
.TIF Tag Image File Format (TIFF) bitmap
.TIFF Tag Image File Format (TIFF) bitmap
.TIG Tiger file, used by US government to distribute maps
.TLB OLE Type Library
.TMP Windows temporary file
.TRM Terminal file
.TRN MKS Source Integrity project usage log
.TTF TrueType font
.TWF TabWorks file
.TWW Tagwrite Template
.TX8 MS-DOS Text
.TXT Text
.T2T Sonata CAD modelling software file

U
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.UDF Windows NT Uniqueness Database File
.ULT Ultratracker music module (MOD) file
.URL Internet shortcut
.USE MKS Source Integrity file

V
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.VBP Visual Basic Project
.VBW Microsoft Visual Basic workspace
.VBX Visual Basic custom control
.VCF Vevi Configuration File; defines objects for use with Sense8's WorldToolKit
.VDA Targa bitmap
.VI Virtual Instrument file from National Instruments LABView product
.VLB Corel Ventura Library
.VOC Creative Labs Sound Blaster sound
.VP Ventura Publisher publication
.VSD Visio drawing (flow chart or schematic)
.VST Targa bitmap
.VSW Visio Workspace file
.VXD Microsoft Windows virtual device driver

W
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.WAD Large file for Doom game containing video, player level, and other information
.WAV Windows Waveform sound
.WB1 QuattroPro for Windows spreadsheet
.WB2 QuattroPro for Windows spreadsheet
.WBK Microsoft Word Backup
.WBL Argo WebLoad II upload file
.WCM WordPerfect Macro
.WDB Microsoft Works database
.WEB CorelXara Web document
.WGP Wild Board Games data file
.WID Ventura width table
.WIL WinImage file
.WIZ Microsoft Word Wizard
.WK1 Lotus 123 versions 1 & 2 spreadsheet
.WK3 Lotus 123 version 3 spreadsheet
.WK4 Lotus 123 version 4 spreadsheet
.WKS Lotus 123 Worksheet spreadsheet
.WKS Microsoft Works document
.WLF Argo WebLoad I upload file
.WLL Microsoft Word Add-In
.WMF Windows Metafile
.WOW Grave Composer music module (MOD) file
.WP WordPerfect document
.WPW Novel PerfectWorks document
.WP4 WordPerfect 4 document
.WP5 WordPerfect 5 document
.WP6 WordPerfect 6 document
.WPD WordPerfect Demo
.WPD WordPerfect Document
.WPG WordPerfect Graphic
.WPS Microsoft Works document
.WPT WordPerfect Template
.WQ1 QuattroPro/DOS spreadsheet
.WQ2 QuattroPro/DOS version 5 spreadsheet
.WRI Write document
.WRL Virtual Reality model
.WS1 WordStar for Windows 1 document
.WS2 WordStar for Windows 2 document
.WS3 WordStar for Windows 3 document
.WS4 WordStar for Windows 4 document
.WS5 WordStar for Windows 5 document
.WS6 WordStar for Windows 6 document
.WS7 WordStar for Windows 7 document
.WSD WordStar 2000 document
.WVL Wavelet Compressed Bitmap

X
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.XAR Corel Xara drawing
.XLA Microsoft Excel add-in
.XLB Microsoft Excel toolbar
.XLC Microsoft Excel chart
.XLD Microsoft Excel dialogue
.XLK Microsoft Excel backup
.XLM Microsoft Excel macro
.XLS Microsoft Excel worksheet
.XLT Microsoft Excel template
.XLV Microsoft Excel VBA module
.XLW Microsoft Excel workbook / workspace
.XM FastTracker 2, Digital Tracker music module (MOD) file
.XR1 Epic MegaGames Xargon data file
.XTP XTree data file
.XY3 XYWrite III document
.XY4 XYWrite IV document
.XYP XYWrite III Plus document
.XYW XYWrite for Windows 4.0 document

Y
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.YAL Arts & Letters clipart library
.YBK Microsoft Encarta Yearbook

Z
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.Z Unix Gzip
.ZIP Zip file
.ZOO An early compressed file format

Numbers and symbols
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.000-999 Used to number old versions of files and number related data files 
.12M Lotus 123 97 Smartmaster file
.123 Lotus 123 97 file
.2GR and 3GR VGA Graphics driver/configuration files under Windows
.386 A file for use in an 80386 or higher microprocessor
.669 Composer 669, Unis Composer music mod file
.#01 and higher A method of numbering picture files for a roll of film that has been scanned 
.$$$ Used by OS/2 to keep track of archived files
.@@@ Screen files used in the installation and instruction on use of applications 

 

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