File Types

.$$$	Temporary file
.2GR	A file that allows Windows to display text and graphics in standard mode on a 286 or 386 computer (filename extension).
.386	Swap file; enables computer running in enhanced mode to use Windows with virtual memory (filename extension).
.3GR	A file that allows Windows to display text and graphics in enhanced mode on a 386, 486, or Pentium computer (filename extension).
.906	Calcomp plotter
.A3W	MacroMedia Authorware Windows 3.5 (filename extension).
.ABK	AutoBackup, Corel Draw (filename extension).
.ABR	Brush - Adobe Photoshop (filename extension).
.ACL	Keyboard accelerator, Corel Draw 6 (filename extension).
.ACM	Windows system directory file (filename extension).
.ACV	Drivers for compressing or decompressing audio files, OS/2 (filename extension).
.AD	After Dark
.ADB	1. Appointment DataBase, HP 100LX (filename extension). 2. Body file type, Ada language (filename extension).
.ADD	Adapter Driver - OS/2 (filename extension).
.ADM	AfterDark MultiModule (filename extension).
.ADR	AfterDark Randomizer (filename extension). AfterDark is a screensaver program that can be set to randomly display a variety of screensaver patterns one after another.
.ADS	Specification file type, Ada language (filename extension).
.AFM	Adobe Font Metrics - Type 1 font metrics (filename extension).
.AG4	Access G4
.AI	Adobe Illustrator
.AIF	Audio Interchange File Format or AIFF (filename extension). A format developed by Apple Computer for storing high-quality sampled audio and musical instrument information. It can be played on PC and Mac.
.aiff	Audio 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.
.ALL	Arts and Letters Library (filename extension).
.ANI	Animated cursor (filename extension).
.ANS	ANSI text (filename extension).
.API	Application Program Interface (filename extension). An interface between the operating system and application programs.
.APP	MacroMedia Authorware package (filename extension).
.ARC	ARC or ARC+ compressed
.arj	A PC compressed format found on European sites (filename extension), which can be decoded with unArjMac, DeArj, and SITEX10.EXE (win).
.ART	An art file, in some draw or paint applications (filename extension).
.ASC	ASCII text file
.ASF	Active Streaming File - HoTMetaL Pro (filename extension).
.ASM	Assembly Source Code
.ASP	Active Server Page - Microsoft (filename extension).
.AST	Assistant file - Claris Works (filename extension). 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, to find documents, etc.
.ATT	AT&T
.AU	A sound file format used on Sun Microsystems or other UNIX computers
.AVI	AVI movie format
.AVS	Intel video capture format (filename extension).
.b64	Base 64 (filename extension), the encoding format used by the Multipurpose Internet Mail Extension.
.BAK	Backup copy in DOS or OS/2
.BAS	BASIC program file
.BAT	Batch
.BFC	Briefcase document - Windows 95 (filename extension).
.BG	Backgammon game (filename extension).
.BI	Binary file (filename extension).
.BIN	Driver
.bin	A MacBinary II encoded file (filename extension). This file type, downloaded as MacBinary or Binary, can be decompressed with Stuffit Expander.
.BK	Backup copy
.BK$	Backup file (filename extension).
.BLT	Wordperfect for DOS (filename extension).
.BMP	Bitmap
.BNK	Sim City game file (filename extension).
.BRX	Browse Index (filename extension). Found on multimedia CD-ROMs.
.BTM	Batch file - Norton Utilities (filename extension).
.C	C program file
.CAB	Microsoft compressed format
.CAL	Calendar or CALS
.CAP	Caption
.CBT	Computer-Based Training; a tutorial file (filename extension).
.CCH	Corel chart (filename extension).
.CCM	Lotus cc:Mail (filename extension).
.CDA	CD Audio track (filename extension).
.CDR	CorelDraw
.CDT	Corel Draw template (filename extension).
.CDX	Corel Draw compressed file (file extension).
.CDX	Visual FoxPro database index (filename extension).
.CFB	Compton’s multimedia encyclopedia (filename extension).
.CFG	Configuration
.CFL	Corel Flow (filename extension).
.CGI	Common Gateway Interface (filename extension). A file that makes it possible for HTTP servers to interface with computer programs to provide interactive functions like fill-out forms.
.CGM	CGM graphics
.CHK	Checkdisk - DOS
.CHP	Chapter - Ventura
.CIF	Chapter Information - Venture
.CIM	Sim City file (filename extension).
.CIT	Intergraph scanned image
.CLP	Clipboard
.CMD	Command file -- OS/2
.CMF	Corel MetaFile (filename extension).
.CMF	SoundBlaster file (filename extension).
.CMP	LEAD Technologies graphics
.CMV	Corel Move animation (filename extension).
.CNF	Configuration file (filename extension).
.CNQ	Compuworks Design Shop (filename extension).
.COB	COBOL source code
.COM	Command file - small version of .EXE
.CPE	Fax Cover document (filename extension).
.CPI	Code Page - DOS
.CPL	Control Panel - Windows
.CPP	C++ program file
.CPR	Knowledge Access graphics
.CPT	Compact Pro
.CPX	Corel Presentation Exchange compressed file (filename extension).
.CRD	Windows Cardfile (filename extension).
.CSC	Corel Script (filename extension).
.CSS	Cascading Style Sheet (filename extension).
.CSV	Comma delimited
.CTL	Control file (filename extension).
.CTY	City file - SimCity (filename extension).
.CUR	Windows cursor image
.CUT	Dr. Halo graphics
.CV	Microsoft CodeView (filename extension).
.CWK	Claris Works (filename extension).
.CWS	Claris Works template (filename extension).
.DAT	Data
.DB	Table - Paradox
.DBC	Visual FoxPro database (filename extension).
.DBF	Database File - dBASE
.DBT	Database text - dBASE
.DBX	DATABEAM graphics
.DCA	IBM text
.DCS	Color Separation - EPS
.DCT	Dictionary
.DD	Disk Doubler
.DDI	Disk Doubler Image (filename extension).
.DEF	Definition - C++ (filename extension).
.DER	Certificate (filename extension).
.DEV	Device driver file (filename extension).
.DG	Autotrol graphics
.DGN	Intergraph graphics
.DIB	DIB graphics - Windows
.DIC	Dictionary
.DIF	Data Interchange Format spreadsheet
.DLL	Dynamic link library
.DOC	Document file
.DOT	Document Template - Microsoft Word (filename extension).
.DOX	MultiMate document
.DPI	Dots Per Inch - graphics
.DPR	Delphi project file (filename extension).
.DRV	Driver
.DRW	Designer graphics
.DS4	Designer graphics, version 4
.DSF	Designer graphics, version 6
.DWG	AutoCAD vector format
.DWG	Drawing - AutoCAD (filename extension).
.DX	Document Imaging
.DXF	AutoCAD vector format
.ED5	EDMICS graphics
.EMF	Enhanced Windows Metafile (filename extension).
.eml	electronic mail
.enc	encoded
.EPS	Encapsulated PostScript format
.ESI	Esri plot file
.EXE	Executable file -- machine code
.FAX	Fax
.FDX	Force Index
.FH3	Aldus Freehand 3 (filename extension).
.FLC	AutoDesk animation
.FLD	Thumbnail folder - Hijaak
.FLI	AutoDesk animation
.FLR	Live3D (filename extension).
.FLT	Filter - graphics conversion
.FM	Framemaker (filename extension).
.FM3	Format for 1-2-3 Version 3
.FMT	Format - dBASE
.FNT	Font
.FOG	Fontographer font (filename extension).
.FON	1. Bitmapped Font - Windows 2. Phone
.FOR	FORTRAN
.FOT	Windows TrueType font
.FOX	FoxBase
.FP	Claris FileMaker Pro (filename extension).
.FP1	Flying Pigs (filename extension).
.FP3	Filemaker Pro 3
.FPX	FlashPix bitmap (filename extension).
.FRM	Form design -- Visual Basic
.FRS	WordPerfect Graphics Driver
.G4	GTX RasterCAD
.GCA	GOCA graphics
.GED	Arts & Letters graphics
.GEM	GEM graphics
.GEO	VideoScope (filename extension).
.GIF	Graphics Interchange Format
.GLY	Glossary
.GP3	CCITT compressed Group 3 TIFF file (filename extension).
.GP4	Group 4 - CALS, ITU (filename extension). CCITT compressed Group 4 TIFF file.
.GRA	Microsoft Graph (filename extension).
.GRF	Graph
.GRP	Group
.GX1	Show Partner graphics
.GX2	Show Partner graphics
.GZ	GNU gzip compressed file - Unix
.H	Header (filename extension -- C).
.HDF	Hierarchical Data File
.HED	HighEdit document (filename extension).
.HEL	Microsoft Hellbender game file (filename extension).
.HGL	HP Graphics Language (filename extension).
.HLP	Help
.HPJ	Help Project - Visual Basic (filename extension).
.HPL	HP Graphics
.HQX	BinHex (filename extension -- Macintosh).
.HST	Host
.HT	HyperTerminal (filename extension).
.htm	DOS filename extension for a document with HTML coding, which can be read by WWW browsers.
.html	Filename extension for a document with HTML coding, which can be read by WWW browsers.
.HWP	Hangul Word Processor (filename extension).
.HYC	Hyphenation - WordPerfect
.HYP	Hyphenation
.ICA	IOCA graphics
.ICB	Targa bitmap (filename extension).
.ICM	Image Colour Matching (filename extension).
.ICO	Icon - Windows or OS/2
.ICON	Sun icon and cursor
.IDD	Instrument Definition - MIDI (filename extension).
.IDE	Integrated Development Environment configuration (filename extension)
.IDX	Index
.IFF	Amiga
.IGF	Inset Systems graphics - Hijaak
.IIF	Interchange File - QuickBooks for Windows (filename extension).
.IL	Icon Library
.ima	Winimage compressed format These files can be decoded or mounted by ShrinkWrap.
.image	Mac disk image (filename extension); a compressed format which can be decoded or mounted by DiskCopy, Disk Image Mounter, Disk Charmer, and ShrinkWrap (ImageMaster).
.IMG	Image. This 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.
.IND	Index
.INF	Information
.INI	Initialization - configuration settings
.IOB	Imagine file (filename extension).
.ISU	Netscape file (filename extension).
.IT	MOD music file format (filename extension).
.IW	Idlewild screensaver (filename extension).
.IX	Index File - Framemaker (filename extension).
.JFF or .JFIF	JPEG File Interchange Format; a 24-bit graphic format. It can be opened with QuickTime, a WWW browser, or a graphics viewer such as JPEGView.
.JIF	JPEG Image Format (filename extension).
.JPEG	JPEG bitmap (filename extension).
.JPG	JPEG
.JT	JT Fax
.JTF	JPEG bitmap (filename extension).
.KDC	Kodak Photo-Enhancer (filename extension).
.KFX	Kofax
.LBL	Label - dBASE
.LBM	Deluxe Paint graphics file
.LDB	Lock file - Microsoft Access (filename extension).
.LEG	Legacy document (filename extension).
.lha	Filename extension for a PC/Amiga compression format decodable by LHA Expander or MacLHA.
.lhs	Literate Haskell source file
.lhz	LHA compression file
.LIB	Library
.LIC	License file - shareware (filename extension).
.LOG	Log
.LST	List (filename extension).
.LWP	Lotus Word Pro document (filename extension).
.LZH	LHARC compression
.lzs	PC/Amiga compression format
.M3D	Motion 3D - Corel (filename extension).
.MAC	MacPaint
.MAF	Microsoft Access Form (filename extension).
.MAK	Makefile
.MAM	Microsoft Access Macro (filename extension).
.MAP	Map - linkage editor
.MAQ	Microsoft Access Query (filename extension).
.MAR	Microsoft Access Report (filename extension).
.MAT	Microsoft Access Table (filename extension).
.MCS	MathCAD format
.MCW	Microsoft Word for Macintosh (filename extension).
.MDB	Access database
.MDX	Multi-index
.MET	Metafile - OS/2
.MEU	Menu
.MFF	MIDI File Format (filename extension).
.MGF	Micrografx Draw Font (filename extension).
.MI	Miscellaneous (filename extension).
.MIC	Microsoft Image Composer (filename extension).
.MID	MIDI
.MIFF	An ImageMagick file format
.MIL	Group 4
.mime	MIME (filename extension); the encoding format used by the Multipurpose Internet Mail Extension.
.MME	Mime encoded file (filename extension); the encoding format used by the Multipurpose Internet Mail Extension.
.MMF	Microsoft Mail File (filename extension).
.MMM	Macromind animation
.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.
.moov	QuickTime movie. This file can be viewed with QuickTime Player.
.MOV	Movie - QuickTime
.movie	QuickTime movie. This file can be viewed with QuickTime Player.
.MOZ	Mozilla - Netscape cache file (filename extension).
.mp2	MPEG Layer II compressed audio. This file can be played using QuickTime Player and some other sound players.
.mp3	MPEG Layer III compressed audio. This file can be played with QuickTime Player, Real Player, and some other sound players.
.MPE	MPEG (filename extension).
.MPEG	MPEG movie or animation file. This file can be played with QuickTime Player.
.MPG	MPEG encoded file. This file is an MPEG movie, and can be played with QuickTime Player.
.MPNT	Macintosh MacPaint
.MPP	Microsoft Project project file (filename extension).
.MPT	Microsoft Project template file (filename extension).
.MPX	Microsoft Project export file (filename extension).
.MRK	Markup - Informative Graphics
.MSG	Message file
.MSN	Microsoft Network document (filename extension).
.MSP	Microsoft Paint
.MUS	Music (filename extension).
.MVB	Microsoft Multimedia Viewer (filename extension).
.MYS	Myst saved game file (filename extension).
.NDX	Index - dBASE
.NET	Network file (filename extension).
.NG	Norton Guides
.NLM	NLM program - NetWare
.NTF	Notes Template File - Lotus Notes database (filename extension).
.OAB	Outlook Address Book - Microsoft (filename extension).
.OAZ	OAZ Fax
.OBD	Microsoft Office Binder (filename extension).
.OBJ	Object module
.OCX	Object Linking and Embedding (OLE) Custom Control (filename extension).
.OLB	OLE Object Library (filename extension).
.OLE	OLE object (filename extension).
.ONX	Onyx Graphics Postershop (filename extension).
.ORI	Original
.OVL	Overlay module
.OVR	Overlay module
.OZM	Sharp Organizer memo bank
.OZP	Sharp Organizer telephone bank
.P10	Tektronix Plot10
.PAB	Personal Address Book - Microsoft (filename extension).
.PAK	Quake game data (filename extension).
.PAL	Paintbrush palette (filename extension).
.PAS	Pascal program file
.PAT	Pattern - Corel Draw (filename extension).
.PBK	Microsoft Phonebook (filename extension).
.PBM	Portable Bit Map
.PCD	Photo CD format
.PCL	HP LaserJet
.PCM	LaserJet cartridge information
.PCS	PICS animation (filename extension).
.PCT	PC Paint
.PCW	PC Write
.PCX	1. PC Paintbrush 2. Graphics file - Zsoft format
.PDF	Portable Document Format
.PDG	PrintShop Deluxe (filename extension).
.PDV	PC Paintbrush printer driver
.PFA	Type 1 font - ASCII
.PFB	Type 1 font - encrypted
.PFM	Postscript Font Metrics; Windows Type 1 font metrics
.PGL	HPGL 7475A plotter - vector graphics
.PGM	Portable Gray Map bitmap (filename extension).
.PHTML	HTML document with preprocessing instructions (PPIs) (filename extension).
.PIC	PICT graphics format, or PIXAR picture file
.PICT	Macintosh QuickDraw/PICT This kind of file stores images in QuickDraw vector format. PICT2 can have grayscale bitmapped images also.
.PIF	Program Information File - Windows
.PIT	PackIt - Macintosh compression
.PIX	Inset Systems graphics
.PJX	Project file - Visual FoxPro (filename extension).
.pkg	AppleLink package compression format These files are decodable by StuffIt Expander.
.PL	Perl script (filename extension).
.PLT	Plotter drawing (filename extension).
.PM	PageMaker
.PM3	PageMaker 3 document
.PM4	PageMaker 4 document
.PM5	PageMaker 5 document
.PNG	1. Portable Network Graphics bitmap (filename extension). 2. Paint Shop Pro Browser (filename extension).
.POV	Persistence Of Vision raytracer (filename extension).
.PPA	PowerPoint Add-in - Microsoft (filename extension).
.PPD	PostScript Printer Description
.PPM	Portable PixelMap (filename extension).
.PPS	PowerPoint Slideshow (filename extension).
.PPT	PowerPoint presentation (filename extension).
.PRD	Printer driver - Microsoft Word, Word Perfect, Microsoft Works (filename extension).
.PRG	A dBASE source code file
.PRJ	Project file
.PRN	1. Print file - temporary 2. XyWrite printer driver 3. PostScript file
.PRS	WordPerfect printer driver
.PRT	Formatted text
.PS	PostScript. This is a plain text file.
.PUB	Publication - Ventura Publisher, Microsoft Publisher (filename extension).
.PWD	Pocket Word document - Microsoft (filename extension).
.PWZ	Microsoft PowerPoint Wizard (filename extension).
.PXL	Microsoft Pocket Excel (filename extension).
.QBW	QuickBooks for Windows (filename extension).
.QDK	Quarterdeck Qemm (filename extension).
.QLB	Quick Library (filename extension).
.QLC	ATM font information
.QRY	Microsoft Query (filename extension).
.qt	QuickTime movie, binary file type (filename extension).
.QTM	QuickTime Movie (filename extension).
.R8L	LaserJet landscape font
.R8P	LaserJet portrait font
.RA	RealAudio
.RAM	Real Audio
.RAS	Raster graphics - Sun
.RAW	Raw file format - bitmap (filename extension).
.rc	A filename extension found in many UNIX files (.newsrc, etc.) which means "run commands".
.REC	Windows Recorder macro file (filename extension).
.REG	Registration file (filename extension).
.REP	Report file (filename extension).
.RFT	RFT-DCA (filename extension).
.RGB	An SGI RGB image file
.RIA	Alpharel Group IV raster graphics
.RIB	Renderman graphics
.RIC	Roch FaxNet
.RIF	Fractal Painter bitmap (filename extension).
.RIFF	Resource Interchange File Format A multimedia file format; the Microsoft equivalent to Amiga IFF format.
.RIX	RIX virtual screen
.RLA	Wavefront raster image
.RLC	CAD Overlay ESP - Image Systems
.RLE	Run Length Encoded
.RM	Real Media.
.RMI	RIFF MIDI file
.RND	AutoShade format
.RNL	GTX Runlength raster graphics
.RPT	Report file (filename extension).
.RTF	Microsoft text and graphics
.S	Assembly language file - Unix
.S3M	MOD music file (filename extension).
.SAM	AmiPro
.SAV	Saved game (filename extension).
.SBP	IBM Storyboard graphics / Superbase text
.SC	Source Code - Paradox
.SCM	ScreenCam movie
.SCP	Dial-up networking script (filename extension).
.SCR	1. Screensaver - Windows. 2. Screen Layout - dBASE. 3. Script for Apple's Disk Copy utility.
.SCT	Screen Capture Text - Lotus
.SDL	SmartDraw Library (filename extension).
.SEA	Self-Extracting Archive (Stuffit or Compact Pro)
.SEG	Segment (of a compressed file saved in segments with Stuffit or Compact Pro)
.SEP	TIFF bitmap (filename extension).
.SET	Setup parameters
.SFL	LaserJet landscape font
.SFP	LaserJet portrait font
.SFS	PCL 5 scalable font
.shar	UNIX shell archive (filename extension), which can be decoded by Unshar.
.SHTML	HTML file with embedded server-side includes (SSIs) (filename extension).
.SI	SoftImage image file
.sig	Signature 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.
.SIT	Stuffit compressed file
.SLD	AutoCAD slide
.SLK	Symbolic Link (SYLK) spreadsheet (filename extension).
.SMI	Self-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.
.SND	Sound file
.SNM	Netscape mail (filename extension).
.SPD	Speedo scalable font
.spx	Screen Peace Extension
.SQB	SyQuest Backup (filename extension).
.SRC	A file used in the creation of .INI files for configuration settings (filename extension).
.STY	Style sheet - Ventura
.SVX	Amiga 8SVX sound (filename extension).
.SWP	Swap - temporary file (filename extension).
.SYD	Sysedit backup file (filename extension).
.SYL	SYLK spreadsheet format
.SYNU	SDSC Synu image
.SYS	System file
.TAL	Adobe Type Align
.TAR	Tar - Tape ARchive (filename extension). 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.
.tar.gz	Combined filename extension for a file that has been archived using tar and then gzipped.
.tar.z or .tar.Z	Combined filename extension for a file that has been archived using tar and then zipped.
.taz	Another way of writing .tar.Z
.TBK	Asymetrix Toolbook (filename extension).
.TDF	Typeface definition - Speedo
.TEX	Tex or LaTex document
.TFM	Font metrics - Intellifont
.TGA	TARGA graphics
.tgz	Another name for .tar.z and .tar.gz
.THEME	Desktop theme - Windows 95 (filename extension).
.THN	Thumbnail (filename extension).
.TIF	TIFF graphics file
.TIFF	TIFF graphics file (filename extension).
.TLB	OLE Type Library (filename extension).
.TMP	Temporary file
.TOC	Table Of Contents (filename extension).
.TRM	Terminal settings - Windows (filename extension).
.TTC	TrueType compressed font
.TTF	TrueType font
.TWF	TabWorks File (file extension).
.TX8	MS-DOS text (filename extension).
.TXT	ASCII text file
.USL	LaserJet landscape font
.USP	LaserJet portrait font
.uu	Uuencode compressed file
.uue	Uuencode file
.VBP	Visual Basic Project (filename extension).
.VBX	Visual Basic Extension
.VDA	Targa bitmap (filename extension).
.VGR	Ventura
.VIFF	Khoros Visualization image file
.VLB	Ventura Library (filename extension).
.VOC	Sound Blaster
.VP	Ventura Publisher (filename extension).
.VST	Targa bitmap (filename extension).
.VUE	Relational View - dBASE
.VXD	Virtual Device Driver (filename extension).
.WAB	Windows Address Book (filename extension).
.WAV	Sound file
.WBK	Microsoft Word Backup (filename extension).
.WDB	Microsoft Works Database (filename extension).
.WID	Ventura width table (filename extension).
.WIN	Windows backup file (filename extension).
.WIZ	Microsoft Word Wizard (filename extension).
.WK1	Lotus 1-2-3, up to 2.01
.WK3	Lotus version 3
.WK4	Lotus version 4
.WKQ	Quattro spreadsheet
.WKS	1. Lotus Worksheet (filename extension). 2. Microsoft Works document (filename extension).
.WLR	VRML page
.WMF	Windows Metafile
.WP	WordPerfect
.WPD	1. Windows Printer Description (filename extension). 2. WordPerfect Demo (filename extension). 3. WordPerfect Document (filename extension).
.WPG	WordPerfect Graphics
.WPM	WordPerfect macro
.WPS	Microsoft Works document
.WPT	WordPerfect Template (filename extension).
.WRI	Windows Write document
.WRK	Symphony spreadsheet
.WS1	WordStar for Windows 1 document (filename extension).
.WS2	WordStar for Windows 2 document (filename extension).
.WS3	WordStar for Windows 3 document (filename extension).
.WS4	WordStar for Windows 4 document (filename extension).
.WS5	WordStar for Windows 5 document (filename extension).
.WS6	WordStar for Windows 6 document (filename extension).
.WS7	WordStar for Windows 7 document (filename extension).
.WVL	Wavelet compressed bitmap (filename extension).
.X	AVS X image file
.XAR	Corel Xara drawing (filename extension).
.XBM	X Bitmap
.XFX	JetFax
.XIF	Xerox Image Format (filename extension).
.XLC	Excel chart
.XLK	Microsoft Excel backup (filename extension).
.XLM	Microsoft Excel macro (filename extension).
.XLS	Excel worksheet
.XLT	Microsoft Excel template (filename extension).
.XM	MOD music format (filename extension).
.XPM	X Pixelmap
.XWD	X Window System window dump image
.XXE	Xxencoded file (filename extension).
.YAL	Arts & Letters click art (filename extension).
.Z	Unix compress file
.ZIP	File compressed using PKZIP
.ZOO	Zoo
assistants	A special kind of file used by 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, to find documents, etc.
bad fix	A failed attempt to repair a computer bug; a fix that doesn't work or that introduces new and unexpected problems. The expression has cropped up a lot in relation to Y2K fixes.
BinHex	A format in which Macintosh binary files are temporarily encoded as ASCII files for transmission over the Internet. The Internet was originally designed for transferring text messages (7-bit files) from one computer to another. Binary files are 8 bits wide. An 8-bit file transmitted over the Internet can lose one-eighth of its data. BinHex encoding puts the 8-bit wide file into a 7-bit text format. Also, Macintosh files have a resource fork and a data fork; the resource fork is normally lost when a file is converted to a 7-bit format. BinHex preserves the resource fork, as well as the data fork, in Macintosh files. The BinHex format is not a compression format; it makes the file larger, and a file encoded in BinHex format will take longer to transmit. BinHex also converts the file back into its original format after transmission. The filename extension for BinHex files is .hqx. See also Macintosh file, MacBinary.
EXE	An executable binary file, marked with the .EXE filename extension in MS-DOS, Windows, OS/2, and VAX/VMS.
LHA	A DOS compression program. Compressed files have the extension .lhz.
MBX	Message Base - Eudora (filename extension).