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If you have a file that you dont know what it is or that you need to know how to open it. Hit CTRL F and type in the extension. click on the links if you need to know how to open them or what program to use. Links provided by http://www.file-extensions.org

.daa	PowerISO Direct-Access-Archive
.torrent	BitTorrent information file
.7z	7z is the compressed archive file
.flac	Audio files encoded by Flac - free lossless audio codec
.cbr	Comic Book Archive file or ComicBook Reader File
.thm	Sonyericsson mobile phone theme file
.wps	Microsoft Works document
.#$#	Unknown or unassigned file extension.
.000	IsoBuster CD/DVD Image File Data Recovery
.3dr	3DMark result
.w02	TEMP file
.bin	Binary file
.psf	Photoshop ProofSetup
.rar	RAR compressed archive. Backup file
.exe	Executable file
.xlsx	Excel 2007 XML Workbook
.zix	WinZix compressed archive file
.zm9	ZSNES Movie #9
.zip	Compressed ZIP archive file and compressed folder
.cdr	CorelDRAW vector image
.b6i	Possibly splitted RAR archive
.m3u	MP3 songs playlist file
.iso	CD/DVD ISO binary image file.
.dotx	Word 2007 XML Template
.001	Compressed file from a multi-volume archive
.dda	Import file format used with TNTmips
.ape	Monkey's Audio Lossless Audio Compression Format
.pptx	PowerPoint 2007 XML Presentation
.bc!	Bittorent unfinished download file
.dat	Generally text or binary datafile
.vcd	Virtual CD-ROM CD Image File
.psf	ArcSoft PhotoStudio File image format
.avi	Audio Video Interleave movie
.docx	Microsoft Word 2007 XML based document file format
.xlsm	Excel 2007 XML Macro-Enabled Workbook
.zm9	ZoneAlarm Mailsafe Renamed .ZIP File
.wdb	Microsoft Works database
.mdi	Microsoft Office Document Imaging file format
.accdt	The file extension for Access Database Templates
.cue	Cue sheet. Description File for a CD-Image (.bin file)
.abr	Adobe Photoshop Brush file
.shs	Shell Scrap Object
.thm	THuMbnail bitmap image used by eg. Picture Publisher and PhotoMagic Thumbnail
.ppsx	PowerPoint 2007 XML Show
.mds	Image file created by burning software
.tao	IsoBuster File
.wpd	WordPerfect document
.mdb	Microsoft Access database
.doc	Microsoft Office Word document
.001	(001-0??) Fresh Download Split File
..bmp	Windows BitMap image or Mac File Type
.tar	Unix standard Archive format, Tape Archive
.cbz	Comic Book Archive file or ComicBook Reader File
.ape	Winamp Plug-ins AVS File
.vsd	FlowChart; Visio Document
.001	Often used as backup file
.zix	Quicken online file
.prt	NX part file
.uwl	Corel WT User Word List
.m3u8	The unicode version of m3u playlist file
.prt	PTC Pro/Engineer Part file
.nco	Nero BackItUp Compressed Backup File (Nero AG)
.docm	Word 2007 XML Macro-Enabled Document
.psp	Photoshop Preferences File
.tmp	temporary file
.djvu	DjVu File AT&T
.pdf	Portable document format: Adobe Acrobat File
.7zip	7z compressed archive file
.cwk	Claris Works data file
.xls	Microsoft Office Excel spreadsheet
.srt	Movie subtitle file format
.cdr	Corel Draw Bitmap (preview) image format
.psd	Adobe Photoshop graphics
.003	Compressed file from a multi-volume archive
.ratDVD	ratDVD commpressed DVD movie
.psb	Photoshop's Large Document Format
.amr	Adaptive Multi-Rate compressed audio
.ai	Adobe Illustrator graphics
.pptm	PowerPoint 2007 Macro-Enabled XML Presentation
.dbf	Database file (many db programs, originaly only dBASE)
.bmp	standard Windows Bitmap image (also OS/2 )
.001	(001-999) HJSplit File
.flv	Flash video file
.fdb	Database file, FoxPro, Firebird
.001	Hayes JT FAX fax
.xpi	Firefox browser extension
.930	Unknown or unassigned file extension.
.dmp	Memory dump, screen dump, junk files...
.wps	Rockbox Theme
.a01	Compressed and splitted ARJ archive file (part1)
.001	Fax data file
.cfg	Configuration file
.nrg	Nero-Burning Rom (CD-burn image)
.asc	ASCII-text
.mp3	Compressed audio, music file
.eps	Adobe Illustrator text and graphics (Encapsulated PostScript)
.mp4	MPEG-4 file format
.3gp	Multimedia files for wireless networks
.wba	WindowBlinds Desktop visual style
.tla	TLA - The Temporal Logic of Actions

.jpg	JPEG Image
.ldb	MS Access Record-Locking Information
.img	Bitmap Graphic (several programs)
.swf	ShockWave Flash, Animated Vector Format for Internet
.xvid	XviD Codec
.lwp	Lotus Word Pro file
.ace	Compressed file archive
.psp	PaintShop Pro Image
.mpc	MusePack Audio file
.prt	Solid Edge part file
.tga	Truevision TarGA bitmap image (may be RLE compressed)
.kml	Keyhole Markup Language file
.dbf	data base file for FoxPro
.aspx	ASP.NET script, page
.sav	Generally saved game file type.
.vcd	VisualCADD Drawing File
.sub	Movie subtitle file format
.sav	Configuration data file
.PlayList	PlayList file
.8bf	Plug-in filter for Adobe-compatible paint programs dll
.c4d	CINEMA 4D file format
.ofm	PostScript font description file
.vcd	VirtualDrive CD Image File
.fla	Editable Adobe Flash Movie
.sqm	SoftQuad XMetaL File
.001	Drivespace Virtual Drive
.vhd	Virtual Hard Disk file
.bas	Basic source code
.rar	Mime: application/rar
.001	Ghost Disk Image Span File
.sqm	Microsoft Service Quality Monitoring file
.bik	Video file
.txt	Text file
.jpg	JPEG image file
.adp	Microsoft Access project file
.thm	Sony-Ericsson Thumbnail file
.emf	Enhanced Windows Meta-file picture
.pk4	Doom 3 packed file
.potx	PowerPoint 2007 XML Template
.mdi	MIDI-sequention sound
.dgn	MicroStation Vector graphics (CAD drawing)
.m4p	iTunes Music Store Audio File
.jef	Customizer 11000 Embroidery Layout Software File
.vob	MPEG-2 movie
.001	Tagged Image Format File
.cgr	CATIA MultiCAx plug-in conversin file
.shn	Shorten compressed audio file, lossless format but larger than MP3
.dcm	DICOM: Digital Imaging and Communications in Medicine image file format : Bitmap graphics
.mov	Apple QuickTime Movie file, standard Macintosh video format
.cab	Windows Cabinet Compressed Archive
.gxt	GTA2 Game File
.mdf	Alcohol 120% Disc Image
.jpeg	JPEG image, picture file format. Mac File Type.
.exe	Mime: application/octet-stream
.ppt	Microsoft Office PowerPoint Presentation file format
.b3d	BodyPaint 3D Format
.cpt	Corel PHOTO-PAINT bitmap
.8ba	Adobe PhotoShop Import dll
.mdf	Menu Definition File
.pfb	Adobe Type Manager : Type 1 PostScript font
.ops	Office Profile Settings File
.vcd	Video CD file
.kmz	Compressed Keyhole Markup Language file
.b5t	BlindWrite image file
.jef	DigitizerPro Embroidery Software file
.accdb	The file extension for the new Office Access 2007 file format.
.3ds	3D graphics file
.sav	Saved backup file
.mpg	MPEG 1 video file format
.vy3	VY3 is Samsung Yepp VY-H350H Digital Voice Recorder format
.8li	Adobe Photoshop Plugins file
.dds	Direct Draw Surface
.sgm	Visual Boy Advance Saved State File
.exe	Mime: application/x-msdownload
.djv	DjVu File Bitmap graphics
.fpx	Kodak FlashPiX bitmap image
.xhtml	Libxml Html file
.lnk	Windows Shortcut file, link
.otf	Open type font file format
.wri	Windows Write Document
.psf	ChiWriter - Outline PostScript printer font
.wav	WAVe PCM Sound, standard Windows sound format
.html	Web page file - Hypertext Markup Language
.php	PHP script, page
.ecw	Enhanced Compressed Wavelet image format
.r30	RAR compressed files from a multi-volume archive
.fsh	EA Sports FSH format
.chk	File fragments saved by ScanDisk, CHKDSK or Windows Disk Defragmenter
.cda	CD Audio track
.002	Compressed file from a multi-volume archive
.ade	Microsoft Access project extension file
.cam	Casio QV digital CAMera image
.rdp	Microsoft Windows Remote Desktop Connection settings
.dot	MS Word Document Template
.ppsm	PowerPoint 2007 Macro-Enabled XML Show
.m3u	Highly compressed audio
.003	Driveimage5 Setup file
.aud	Winamp media file
.wm	Windows Media Audio or Video file
.xltx	Excel 2007 XML Template

.wm	Windows Media Audio or Video file
.srt	Skymap data file
.tvv	Format used by TV NOW Portable Video Recorder
.386	Virtual device driver (Windows 386 enhanced mode), Swap file
.bat	Batch file (executable)
.zip	Mime: application/x-compressed
.rm	RealMedia
.x_t	Parasolid document
.rq5	Unknown or unassigned file extension.
.exe	Self-extracting archive
.nwp	NEC-Win Plus proprietary file format
.kdb	Encrypted passwords database file
.wmf	Windows Metafile; vector drawing - clipart.
.raa	Unknown or unassigned file extension. See .ra file extension
.dap	MS Access Data Access Page
.3gp	Nokia 7650 Video Recorder Video File
.sfv	Easy SFV Creator
.vcd	Mime: application/x-cdlink
.ani	Animated cursor
.sql	Structured Query Language Data SQL
.rel	Nokia Phone Audio File
.mno	Macromedia Dreamweaver configuration commands, _notes file
.ogg	Ogg Vorbis audio file open-source music encoder http://www.xiph.org/ogg/vorbis
.000	Common filename extension
.jar	compressed file package for Java classes and data: Java Class Archive
.mdi	Borland multiple document interface
.fb	Backup file made by Novell (DR)Dos' FastBack Express (fbx.exe)
.dts	Digital Surround Audio File Format
.dotm	Word 2007 XML Macro-Enabled Template
.sga	Relic Entertainment SGA Archive
.gci	GTA2 Game File
.img	image file
.tta	TAU Producer file - TTA Lossless audio codec
.tmd	TextMaker 6.0 up to 2006
.3d	Three-dimensional drawing file
.prt	CADkey Part file
.vxd	Microsoft Windows virtual device driver, 32 bit
.wpd	ACT! Word Processor Document
.ifo	DVD datafile
.crw	Canon Digital Camera Raw Image Format
.fon	Bitmap font with fixed size
.vsv	Virtual machine's memory saved-state file
.js	JavaScript file
.dcx	Image Zsoft PC Publisher's Paintbrush (multi-pcx file)
.m4v	MPEG-4 video file format
.accde	Office Access 2007 files that are in "execute only mode
.2d	Two-dimensional drawing file
.com	Compiled executable program
.cso	Customer service data and outcome file
.rtf	Rich Text Format document
.001	(001-0??) Cutkiller Start of a Split File Sequence
.r02	RAR compressed files from a multi-volume archive
.shs	W95/98 Clipboard
.snp	Access 97 report Snapshot
.plmxml	plmxml - xml document format
.xlsb	Excel 2007 Binary Workbook
.pcf	Packaged collaboration files
.#$0	Unknown or unassigned file extension.
.xml	XML document
.tif	Aldus Tagged Image File Format (TIFF) bitmap image
.pcx	PC Paintbrush Bitmap
.aco	Adobe Color Palette and Swatches file
.csv	Comma Separated Value file
.jc!	FlashGet File
.kdb	Doobs Database
.ini	Text configuration file
.sc4	Game file format
.cpp	C++ source code file format
.3ds	Autodesk 3D Studio 3D scene
.htm	Web page - HTML file
.xp3	Unknown or unassigned file extension.
.0bu	Unknown or unassigned file extension.
.iso	CALS ISO 8613: Bitmap graphics
.svf	Simple Vector Format
.ahk	AutoHotkey Script
.qsp	QSetup Installation Suite
.001	International S-57 Hydrographic Data Electronic Navigation Chart
.cr2	Canon Digital Camera Raw Image Format version 2.0
.aud	Audio file used by Westwood Studios for various games
.cur	Windows 3.x/95/NT Cursor Resource
.iw44	DjVu Format
.r00	RAR compressed files from a multi-volume archive
.#$$	Unknown or unassigned file extension.
.theme	Windows Desktop Theme
.nwp	Materials palette file
.jt	DirectModel documents
.wpd	SAW Soud processing file
.chm	Microsoft Compiled HTML help file
.wmv	Windows Media Video
.accdr	Access 2007 file that enables you to open a database in runtime mode
.nwp	Noteworthy Player file type
.ttf	TrueType Font, variable size
.001	SwiftView ICS Command File
.000	ARJ Multi-volume Compressed Archive
.#$1	Unknown or unassigned file extension.
.cmd	Windows NT Command Script
.dat	Extension used for some MPEG files
.uwl	WordPerfect User Word List
.zip	Mime: application/x-zip-compressed
.gif	CompuServe bitmap image (Graphics Interchange Format),widely used Internet Format

.uwl	WordPerfect User Word List
.zip	Mime: application/x-zip-compressed
.gif	CompuServe bitmap image (Graphics Interchange Format),widely used Internet Format
.001	(000 - Any Number) Totem Cash Ad File
.pgt	DHTML menu file
.avs	Winamp Advanced Visualization Studio
.aup	Audacity project file
.avs	Avid Settings file
.nef	Nikon Digital SLR Camera Raw Image File
.raf	Fuji CCD-RAW Graphic File
.&&&	Usually temporary file
.uif	WordPerfect for Win long prompts for Windows
.sub	CloneCD related file
.b00	Graphics
.qxd	QuarkXPress document
.flt	Adobe Illustrator Filter
.007	International S-57 Hydrographic Data Electronic Navigation Chart
.sab	3D ACIS Binary File
.mdn	Microsoft Access blank database template
.ps	MSWORKS file
.tar	Mime: appliation/x-tar
.wba	Winace Zip File
.dmt	Delphi Runimage Delphi Bin file
.wmz	Windows Media Player skins file
.vhd	Quartus II VHDL Design File
.mdml	Markdown markup language
.dxf	3d graphic drawing file
.nwc	Noteworthy Composer Song File
.ps	Adobe PostScript file
.clp	Windows Clipboard
.dat	WordPerfect : Merge data
.psf	MicroStation Plot specification file
.8bi	Photoshop Plugins Formats file
.wmd	Windows Media Player Download Package
.qtz	Quartz graphics file
.dts	Directory toolkit script
.$db	dBASE temporary file
.exe	Self-displaying image
.nwp	Magentic content file
.aud	DTS sound data stream file format
.ascii	ASCII text characters file (sometimes Text graphics)
.mds	Directx Mid2stream file
.iww	Unknown or unassigned file extension.
.eml	Mime: message/rfc822
.wma	Windows Media Audio
.bin	Audio format(short ints,no header)
.cf2	Common File Format 2
.dar	DAR disk archive
.pef	Pentax Digital Camera Raw Image Format
.002	Driveimage5 Setup file
.easm	SolidWorks eDrawing Asembly file
.dbl	LineWriter file
.icd	Rayman2 game file
.SMR	Sid Meier's Railoads save game file
.max	Paperport
.psf	PowerSoft Report File
.sldprt	SolidWorks drawing 3D (Vector graphics)
.gzip	GZIP compressed archive file
.$$$	Temporary file
.arj	Compressed file archive - ARJ archiver
.000-20009	Mostly backup file formats divided into multiple numbered files
.dat	Video CD MPEG movie MPEG1
.000-999	Often backup versions of files
.rel	ACT! Alarm Data File
.pnm	PBM - Portable anymap, bitmap graphics
.ppm	Portable Pixelmap Graphic
.ixv	Unknown or unassigned file extension.
.wpk	Nero Wave Editor file
.mdb	MS file Viewer
.vcf	VirtualDub Processing Settings
.cue	Microsoft Cue Cards data
.img	Disk Copy, ShrinkWrap : Disk Image
.png	Portable (Public) Network Graphic
.pf	Windows prefetch file
.pfn	Portable Bitmap File
.icd	Targa file
.abf	Adobe Binary Screen Font
.pat	Corel Vector Pattern
.php5	PHP script version 5 (HyperText PreProcessor)
.bmp	Mime: image/bitmap
.cdr	Raw audio-CD data
.xml	Extensible Markup Language file
.kgb	Z80 Spectrum Emulator Snap/File Formats
.pps	PowerPoint Slideshow
.m4a	MPEG-4 compressed audio file
.bin	machine language
.dxf	AutoCad Drawing eXchange Format
.eqf	WinAmp equalizer settings file
.dts	Data Transformation Services
.kf	Game file, some graphics
.odt	Unknown or unassigned file extension.
.kdb	kinodb File
.java	Java language source code file
.xls	Mime: application/excel
.gsp	Giza Specifier Project File
.rpc	RAR password cracker project file
.000	HPGL Plot file
.bc	Mikmak 203 file
.eps	Corel-TRACE Encapsulated PostScript
.mp2v	MPEG video file

.000	MS Double Space (eg DBLSPACE.000)
.8bs	Adobe Photoshop 5.0 Sdk Plugins file
.gtar	GNU tar compressed file archive
.gsp	Giza Specifier Project File
.rpc	RAR password cracker project file
.000	HPGL Plot file
.1st	Usually README.1st text file.
.pcd	Kodak Picture CD multiresolution Image
.text	Text file
.vsd	Mime: application/vnd.visio
.vst	Vista Truevision Targa bitmap image.
.doc	Mac File Type
.fdb	Navison Financials database
.flc	Autodesk Animator (AutoDesk FLIC format) (old: .FLI)
.pdf	ArcView : preferences definition file
.swf	Mime: application/x-shockwave-flash
.gsm	Noka LogoManager format
.pt	Page template file
.do	Java servlet file
.pxr	Pixar 3D rendering file
.scpt	AppleScript Script file
.bmf	ByteMap font format
.sub	Rational Rose component package
..wmf	Mac File Type
.asm	Solid Edge assembly file
.bak	Backup file
.dat	MS Word for DOS file
.dmp	ORACLE file
.do	digital line graph optional vestor data
.eta	eTreppid Audio File
.prt	SolidWorks Part file
.8bx	Adobe PhotoShop Plugin Extension
.orf	Olympus Digital Camera Raw Image File
.css	CSS (Cascading Style Sheets) file
.dat	Btrieve Database
.mpeg	MPEG movie
.ra	RealAudio
.006	International S-57 Hydrographic Data Electronic Navigation Chart
.dgd	Unknown or unassigned file extension.
.z2f	Zoo Tycoon 2 file
.abdata	Bridge data
.dib	Device-Independent Bitmap Graphic
.dll	Dynamic Link Library
.flt	Corel filter
.jt	JT Fax Hayes comp.
.lit	Microsoft Reader eBook
.pgm	PBM gray scale bitmap graphics, portable graymap format
.png	Mime: image/png
.z	Unix,compressed, in combin. with tar = taz (modified Lempel-Ziv compression) (Unix SysV pack)
.007	Compressed archive file
.efw	Unknown or unassigned file extension.
.mdv	Workgroup Information Files
.asf	Advanced Systems format
.jpeg	JPEG Image
.org	Lotus organiser file
.pict	Bitmap graphics file format
.ps	PostScript view with Ghostscript viewer
.wvx	Windows Media Video Redirector
...ct	Mac File Type
.qxp	QuarkXpress document file
.#&1	Unknown or unassigned file extension.
.mcl	Microsoft Media Center Application shortcut
.bundle	Type of plugin
.chk	Starcraft Campaign Map
.par	SolidEdge document
.wpd	602PC SUITE Document
.raw	Digital Camera Image Format
.kdb	kusziDataBase Database File
.3mm	Microsoft 3D Movie Maker video file
.dvr-ms	Microsoft Digital Video Recording
.aif	Audio Interchange File Format sound file
.cam	QV-PC 10 Cassio Digital Camera
.dcx	FAX Image
.htaccess	Apache Access Configuration File
.mp2	Sound file (MPEG-1 Layer II Audio Stream)
.iab	Unknown or unassigned file extension.
.ods	OpenDocument Spreadsheet file
.cpl	Windows Control Panel extension
.dap	Omnis5 Application File
.mi	HP CoCreate ME 10 documents
.pcf	Microsoft Source Profiler : Profiler Command File
.smf	Standard MIDI file format
.srf	Sony Digital Camera Raw Image File
.vob	Vue d'Esprit image format
.par	An older version of Solid Edge part file
.acb	Adobe Illustrator ColorBook file
.img	CloneCd Related File
.psb	Pinnacle: Sound Bank file
.psd	Apple Viewer File
.slddrw	Solidworks File
.wv	Mime: video/wavelet
.8by	Photoshop Plugins Formats file
.mkv	Unknown or unassigned file extension.
.931	Unknown or unassigned file extension.
.as	Adobe (formerly Macromedia) Flash action script file
.sab	ALSong Album File
.ops	Dynamite VSP Object Placement Style
.bmp	Alpha Microsystem BMP image format
.nol	Nokia Operator Logo image format
.prt	Attention: file of W32/Parrot-A worm

.ops	Dynamite VSP Object Placement Style
.bmp	Alpha Microsystem BMP image format
.edb	WIN SECURITY file
.nol	Nokia Operator Logo image format
.pbb	MS Mail address information file
.prt	Attention: file of W32/Parrot-A worm
.000	Geoworks Data File
.aww	Ability Write Document
.ece	Unknown or unassigned file extension.
.jpm	JPEG 2000 jpm file format (common name)
.aiff	Audio Interchange File Format
.avs	Bitmap image format
.fdb	font definition block of SWT generator (flash MX)
.log	Log file
.xltm	Excel 2007 XML Macro-Enabled Template
.xlam	Excel 2007 XML Macro-Enabled Add-In
.sxc	OpenOffice.org 1.0 Spreadsheet file
.eta	Keyhole Placemark File
.crt	Internet Security Certificate
.nif	NIFF Navy Image File Format (bitmap) graphics interchange format
.001	Genesis 2000 file
.usx	Unreal Static Meshes file extension
.aca	Agent Character 2
.!!!	Sometimes README text file format
.arp	Aperture file - for other artwork files
.dsf	Micrografx Designer V6.x, V7.x
.nlm	Nokia Logo File image format
.pxr	Photoshop: Bitmap graphics (Pixar image)
.txn	Mfhdf Doc file
.x	Microsoft Direct-X SDK
.wdgt	Dashboard widget
.pwd	SolidEdge document
.dbf	ArcView : Shapefile attribute table file
.dvd	Misc
.imc	game sound similar to wav file format
.dft	SolidEdge document
.atm	Adobe Type Manager file
.big	Michelin (autoroute maps) image format
.com	Common Object Module
.vhd	"Very High-level Design Language" Hardware design document
.pwr	A PWR file is an XPower power report file
.px5	Poker Pal third-party plug-in file
.tk9	Unknown or unassigned file extension.
.as	AppleSingle Encoded File
..0	Compressed harddisk data
.bik	BioCharter Profile Backup
.chk	WordPerfect for Windows temporary file
.dat	Programming
.f	Fortran source files
.itc	Uthscsa Imagetool Calibration file
.mov	AutoCAD AutoFlix MOVie
.mpp	Microsoft Project
.000	CHKDSK Found Folder
.008	International S-57 Hydrographic Data Electronic Navigation Chart
.b6t	Unknown or unassigned file extension.
.esu	LokSound Electronic Sound File
.sgm	Standard Generalized Markup Language IETF SGML Document
.24b	Bitmap graphics (24-bit data)
.lwp	Mime: application/vnd.lotus-wordpro
.r00	Norton Ghost rar file
.vsp	SPX sprite
.zip	Mime: application/zip
.zip	Mime: multipart/x-zip
.936	Unknown or unassigned file extension.
.zix	Caml Light (camlc) debugger file
.cfg	Swisslog System Configuration File
.dat	Antivirus data
.dgn	ArcView Vector graphics (CAD drawing)
.doc	Wordpad text
.eml	Outlook Express EMaiL
.modd	audio modul
.z	Mime: application/x-compress
.!!!	Read Me text file
.gif	Mime: image/gif
.potm	PowerPoint 2007 Macro-Enabled XML Template
.rel	Knowledge Explorer Knowledge Representation Relation
.asp	ASP script, page
.bmp	Mime: image/bmp
.dds	INMOS Transputer Development System Occam Compiler Descriptor
.lnk	Linker response file/script
.mde	Microsoft Access MDE Database
.snp	Shapshot file (Snapview)
.vcf	Outlook Express VCard file
.wk4	Lotus 1-2-3 version 4 spreadsheet
.zma	AAICWpro Mailsafe renamed File = .dll
.$$$	Mostly backup file format - many applications
.pww	Patternland Weave Simulator file format
.rbn	Unknown or unassigned file extension.
.932	Unknown or unassigned file extension.
.dcr	Kodak Digital Camera Raw Image Format
.asc	3D objec, saved as ASCII
.conf	Unix configuration information
.dbf	CLIPPER database
.dwg	AutoCAD Drawing
.rdi	Device independent bitmap file (RIFF RDIB format)
.tif	Mime: image/tiff
.000	Advanced Revelation Database File
.aifc	Audio Interchange File Format sound file with Compression
.ace	Aces200 image format
.dgn	Microstation95 CAD Drawing File

.ace	Aces200 image format
.dgn	Microstation95 CAD Drawing File
.moi	French textfile
.gp	Geoworks Geode parameter file
..0	(0-99) Hacha Split File
.000	International S-57 Hydrographic Data Electronic Navigation Chart
.asc	PGP signature
.opt	MySQL database data file
.pd0	Unassigned file extension
.aa	Audible audio file - downloadable audio books
.avs	Application Visualization System format
.ccd	CloneCd Related File
.dat	MapInfo native data format
.dll	A file containing runtime routines for use with program files.
.hcx	Harvard Chart XL chart
.img	ArcView : ERDAS Imagine image file
.nfo	MsInfo document
.ngg	Nokia Group Graphics image format
.pes	Brother Embroidery file format
.pob	3d Graphics file
.ppt	Microsoft BIFF File
.sldasm	Solidworks File
.tpb	Downloadable PCL Soft font file backup (HiJaak)
.wbmp	Wireless Bitmap (level 0) image format
.!	Screensaver file
.au3	AutoIt Version 3 File
.zo1	Unknown or unassigned file extension.
.!ut	uTorrent incomplete download file
.chk	SSConvert Multilanguage video subtitle data file
.cg4	CALS Group IV : Bitmap graphics
.dat	Word for DOS
.dm	Borland dbase
.efx	Fax (Everex EFax)
.lwp	IBM Works for OS/2 document
.rsm	Mime: model/vnd.gdl
.wb1	Spreadsheet; Quatro Pro for Windows Notebook
.wms	Windows Media Player Skins
.wpd	Windows printer driver
.xfdl	Mime: application/vnd.xfdl
.001	Smartfax
.8bp	Adobe PhotoShop Import
.000	PaperPort Scanned Image
.MYD	MySQL database data file
.exj	Unknown or unassigned file extension.
.mrw	Minolta Diamage Raw Image File
.wdgt	Opera browser widget
.a	Alpha channel image data
.ai	Progress Database After Image file
.ax	Modula-3 linker information for libraries
.bin	Mime: application/x-binary
.ctt	Hotmail List of E-mail Contacts
.dat	May be a propriatary format
.dgn	Intergraph Design Drawing /Vector graphics (CAD drawing)
.php	MS Picture It! Publishing Project File
.sct	SciTex CT (Continuous Tone) bitmap image
.vsd	Mime: application/x-visio
.fbl	Unknown or unassigned file extension.
.#&0	Unknown or unassigned file extension.
.pod	Punch CAD Program
.acbl	Adobe Illustrator ColorBook
.bup	Backup file
.ecw	System Dll file
.ifm	Mime: application/vnd.shana.informed.formdata
.mso	Microsoft Orgchart file
.pod	Perl POD-formated text
.pps	ArcView : processing set codes
.prz	Lotus Freelance Graphics file
.pub	MS Publisher Document
.rfx	Modula M2sds file
.sfk	Sonic Foundry SoundForge : Sound file
.wab	Microsoft Outlook (Address Book file)
.gp3	GuitarPro 3
.006	Compressed archive file
.mv4	Unknown or unassigned file extension.
.wrf	ThinkFree Write document
.z01	Unknown or unassigned file extension.
.#$&	Unknown or unassigned file extension.
.php2	PHP version 2 script (HyperText PreProcessor)
.php3	PHP script, page - version 3
.b3d	3D Builder file
.com	DOS or CP/M executable (COMmand), mostly smaller than 64 Kb
.crmlog	WIN Registration file
.dat	Digital Audio Tape
.dat	Internet Explorer Cache
.dat	Microsoft Exchange Server : Error message in inbound internet email message
.dmg	Macintosh OS X Disk Image File (Treated like a real disk)
.dpg	DPGraph : Mathematical graph
.ecm	Cmpro examples file
.indd	Adobe Indesign Document
.jpg	Mime: image/jpeg
.max	3DStudio Scene
.mht	Message HTML file
.msg	Document; Microsoft Exchange mail document
.ods	NCompass Labs (Internet script/tbv)
.ove	Cakewalk Overture Score
.ps	Mime: application/postscript
.qrp	Dr hardware file
.sta	Statistica : Data file
.trn	Translation (Windows)
.txt	DisplayWrite document

.vem	Voice Email
..pcx	Mac File Type
.baa	Unknown or unassigned file extension.
.t$m	Unknown or unassigned file extension.
.937	Unknown or unassigned file extension.
.sp	SignPlot output format
.c	C programming language source code Borland C++ , CodeWarrior , Microsoft Visual C++
.crb	Cardfile
.cxt	Macromedia Director protected cast file
.dat	VMS Data file
.dvd	Animation
.iff	Amiga IFF/8SVX Interchange File Format : Bitmap graphics
.ifo	Info file
.mbd	Mime: application/mbedlet
.part	Partial Go!Zilla download
.pps	Mime: application/mspowerpoint
.psm	Sound data for Epic's games
.gi	Audio Utility Tuningwrench compressed file
.000	Empower Data File
.ppam	PowerPoint 2007 Macro-Enabled XML Add-In
.emz	Unknown or unassigned file extension.
.ttg	Unknown or unassigned file extension.
.wave	WAVe PCM sound file
.3th	3D Movie Maker Thumbnail Data File (Microsoft)
.cat	Advanced Disk Catalog database file
.aws	Ability Spreadsheet Document
.bin	SGI Powerflip
.dat	WordPerfect Merge Data
.dmp	INMOS Transputer Development System Occam Core Dump
.htm	HyperText Markup Language file (WWW-page)
.ink	Mimio Ink File
.inp	Oracle Source Code
.jpeg	Mac File Type
.mcd	MathCaD file
.mda	Microsoft Access add-in
.mix	image file
.mpg	Mime: audio/mpeg
.out	OUTput
.pa	Print Artist project
.ppt	Mime: application/powerpoint
.raf	Illum src Rk file
.sg	SnapGraphix : Image file
.stp	3d Graphic
.sxw	OpenOffice.org Writer document
.uax	Unreal Audio File
.wk2	Lotus 1-2-3 version 2 spreadsheet
.xps	backup for xport .sps by sharkport
.001	RicohFax
.nbz	Unknown or unassigned file extension.
.amb	Radiance ambient file
.cad	Drafix Windows CAD picture
.cam	Calibrated Camera File Photomodeller
.cdl	CADKey CAD language file
.htr	Scripts that allow Windows NT password services to be provided via IIS web servers
.img	Old or New style Gem Format
.j	Image JPEG / JFIF
.jc	Watcom src file
.msi	Microsoft Installer File, Windows Installer Database
.PHPEditProject	Project file from PHPEdit solution
.rtf	Mime: application/msword
.sig	SIGnature file (ThunderByte AntiVirus/PopMail/PGP)
.sp	Spice : Data
.ssa	Sub Station Alpha : Video file
.wtf	Weird wally screen saver editor file
.gsp	Geometer's Sketchpad Material File
.njb	Unknown or unassigned file extension.
.wjf	Unknown or unassigned file extension.
.#$2	Unknown or unassigned file extension.
.#-7	Unknown or unassigned file extension.
.sga	SEG-A Seismic Data Format
.avs	Avisynth script file
.netrc	.netrc File Format for TCP/IP
.aga	Agenda file
.crc	Check file (Win-SFV32) (Fantasia Software)
.dcm	Mime: x-lml/x-evm
.dvg	Graphics Works list of symbols
.dvr	Program Overlay
.enu	Win Ace204 file
.epb	Mime: application/x-epublisher
.ivp	Beyond 20/20 : User subset profile
.m2	Modula 2 language source
.mpc	Mime: application/x-project
.pcds	Multi-resolution bitmap graphics - Kodak Photo-CD format
.pnf	Windows : Precompiled setup information
.pod	Text file
.prt	Formatted text
.smv	Saved Mail Video
.vmg	Image file
.r31	RAR compressed files from a multi-volume archive
.apn	Unknown or unassigned file extension.
.ots	OpenDocument Spreadsheet Template file
.sug	Unknown or unassigned file extension.
.wd3	Unknown or unassigned file extension.
.#$7	Unknown or unassigned file extension.
.#&&	Unknown or unassigned file extension.
.eprt	SolidWorks eDrawing part file
.big	Chinese text (old version)
.dbx	Outlook Express 5 file
.dll	Mime: application/x-msdownload
.dma	Direct Memory Access programming file

.dvr	Device Driver
.dxf	2d graphic drawing file
.flt	OpenFlight file
.flw	Freelance : Document
.max	Scene (3D Studio Max)
.mde	Microsoft Office file
.mrk	Windows 95 user benchmark
.pf	Aladdin Systems security software : Private File
.pi2	medium resolution Atari Degas Image : Bitmap graphics
.prt	P-CAD component
.wki	Lotus 1-2-3 version 2 spreadsheet
.z	Mime: application/x-compressed
.001-	Game resource file (Indiana Jones,Loom..)
.mbn	Unknown or unassigned file extension.
.#$@	Unknown or unassigned file extension.
.#$3	Unknown or unassigned file extension.
.rel	Norton Internet Security 2001 Log File
.ind	Adobe InDesign graphics document file
.blend	Blender 3D data file
.chk	EpiData check file
.a	Object library
.aac	Homeboy reference (music)
.alb	Graphics album
.au	Unix audio sound file format
.bro	Tree Professional Broadleaf Creator
.btw	Steuer2001 file
.dta	gen Datafile, can be text as well as binary data
.dwl	Textur Editor compressed file
.mus	Sound file (MusicTime/Doom)
.nsf	Lotus Notes data
.ogm	video format
.pcr	PCR Graphic Image
.pds	Adobe Photoshop
.pf	Archive
.prt	Printer formatted file (from a Print-to-file operation)
.prt	Windows directory (with .EXE files of the same root name)
.pxj	Pixtran file
.rle	Raster bitmap image. Same as .bmp filetype
.rpc	ACT! 2.0 Report
.sbf	Superbase 95 File
.t	Alchemy chemical modeller output file
.taf	Tonline Db file
.vol	Volume file (many prg)
.#gf	MetaFont font file
.003	International S-57 Hydrographic Data Electronic Navigation Chart
.elu	Unknown or unassigned file extension.
.emc	Unknown or unassigned file extension.
.hpf	High Performance FORTRAN file
.mab	Mozilla address book file
.rzr	Unknown or unassigned file extension.
.sbr	Scribes report archive file
.asp	Procomm Plus ASPect language script file
.asx	Microsoft Advanced Streaming Redirector file
.dat	SPOT image format
.dpb	Fax master file
.epf	Encapsulated Postscript Image (Image EPSF)
.fh8	FreeHand : Vector graphics
.ifo	ImageForge Pro : Graphic object layer data
.ink	CorelDraw : Pantone reference fills file
.jar	JAR archive from ARJ
.md	Compressed file archive (MDCD)
.mdl	Geometrical model file
.mdz	Ms Access Database Wizard Template
.org	Microcal Origin plot
.part	Mime: application/pro_eng
.pe	PE - Portable Executable file
.png	Browser catalogue (Paint Shop Pro)
.ppt	Mime: application/mspowerpoint
.psm	Turbo Pascal symbol table of IDE
.qds	SavedDsQuery, open with: rundll32 dsquery.dll,OpenSavedDsQuery
.sit	StuffIT Expander archive format, Macintosh
.skf	AutoSketch : Drawing file (Autodesk)
.txx	DataPerfect Text Storage
.vc6	Ms Visual C 6 (make-) file
.vcr	Arvid VCR driver
.vf	vitual terrain software
.xa	Sony Playstation audio files
.!@!	Windows backup of WIN.INI file
.xpx	XML Format File
.frm	MySQL database data file
.0#$	Unknown or unassigned file extension.
.935	Unknown or unassigned file extension.
.saved	Typicaly saved copy of any file format
.ani	Animation (Presidio - many)
.biz	BizTalk compatible schema
.dat	Mitsubishi DJ-1000 and Photorun Native Format
.dbf	dBASE III/IV
.f	Paradox file
.f90	Fortran 90 language source file
.fcd	Virtual CDROM
.iff	Graphic, Sound (Interchangeable File Format)
.jng	JPEG Network Graphic
.ldb	Data filer database (IBM Works for OS/2)
.md5	Checksum file for .SHN audio
.mdt	Microsoft Access Add-in Data
.midi	MIDI-sequention sound
.mpf	Mime: text/vnd.ms-mediapackage
.mpq	Blizzard Game Data File
.mrk	CSI MaRKup file (CAD format)
.msw	Document Microsoft Word

.o	Object file (Unix/GCC)
.pdf	Corel Ventura Publisher page (EPS-variety) file
.qt	Apple QuickTime movie clip
.r03	Norton Ghost rar file
.r??	RAR Compressed File (?? can be 01 to 99)
.rsn	Propellerhead Reason Audio File
.wbz	Webshots image format
.wks	Lotus 1-2-3 spreadsheet
.xlw	Microsoft Excel workbook / workspace
.$vm	Windows 3.x Virtual Manager temporary file
.8bc	Adobe Photoshop 5.0 Sdk Plugins file
.s	Free Pascal Assembler File for Linux or DOS Version (FPC Development Team)
.cfa	Unknown or unassigned file extension.
.ffr	Unknown or unassigned file extension.
.hcb	HyperOS Compressed Backup
.jtd	Ichitaro Document
.nks	Unknown or unassigned file extension.
.uha	Unknown or unassigned file extension.
.#$9	Unknown or unassigned file extension.
.933	Unknown or unassigned file extension.
.att	Bitmap graphics
.b	Batch list
.b3d	Image format
.dgr	Mac File Type
.doc	maybe Microsoft Word .DOT file
.dtl	Windows Applog file
.est	Webalizer.01 Lang file
.img	ADEX Corporation ChromaGraph graphics cards : Bitmap graphics : 4bit or 8bit
.ind	dBASE IV or DataPerfect Index
.isf	Inspiration Mind Mapping Software File
.itd	System Dll file
.jpg	Mime: image/pjpeg
.k	NRJ live file
.lrc	Intel Video Phone file
.mpv	Mime: video/mpeg
.pbm	UNIX Portable bitmap graphic
.pl	Interleaf printerleaf (or WorldView) format
.r08	Norton Ghost rar file
.snd	Unix sound file, similar to AU
.spg	Sprint : Glossary
.srf	TerraGen SuRFace MAP
.tad	Mime: application/octet-stream
.tiff	Mime: image/tiff
.top	IBM netfinity Rack Configurator extension
.u	Bitmap image : subsampled raw YUV file
.vbs	Visual Basic for Applications Script
.wk1	Lotus 1-2-3 version 1 spreadsheet
.wmf	Mime: image/x-wmf
.wri	Mime: application/mswrite
.gfc	Patton&Patton Flowcharting 4 flowchart file
.gsp	Mime: application/x-gsp
.cdi	DiscJuggler related file, probably image file
.000	Trend Micro Pattern File
.amb	AMB is a file extension associated with Alphacam 3D Mill, 2D Mill VB Macro
.bxa	File generated by a feline application that monitor data on a Para Scope.
.dto	Directory Toolkit output file
.hgd	Unknown or unassigned file extension.
.vgz	Unknown or unassigned file extension.
.wpl	Windows Media Player Playlist
.rel	Retrieve 4GL Dataset File
.mcl	MUSHclient World Information File
.cfk	MS Developer Studio Diagram
.mpcpl	Media Player Classic's playlist file
.psm	PrintShop Mail Data File
.avd	File
.bcf	ConfigSafe Snapshot Index
.dat	BLUEWAVE file
.dbd	DemoShield Player
.dbo	dBase IV Compiled Program File
.drf	Photoline Drawing Filter
.dt	DAT backup
.fax	Fax (generic Group 3 1bit encoded data) (most Fax programs)
.fm	Document; FrameMaker Document
.fpk	Form package file (FormFlow)
.htm	Mime: text/html
.inf	Windows setup file/ install script
.ip	IconPackager Icon Set
.jar	Mime: application/java-archive
.l	Lex language source
.ll	Preview file List&Label LLVIEW.exe (combit GmbH)
.m	Objective-C language source (gcc)
.mcd	Mime: application/vnd.vectorworks
.nfo	Netware Folio help format
.ntx	Clipper database index
.oab	MS Outlook Address Book
.org	Mime: application/vnd.lotus-organizer
.pak	Compressed file archive
.pbd	PowerBuilder : Dynamic link library
.pbf	Turtle Beach Pinnacle Bank File
.pbp	Perl Builder file
.pdb	3Com Palmpilot database file
.po	CONFIG 915E file
.psm	Protracker Studio Module (sound)
.psp	Prodea Synergy procedure
.px	Borland Paradox : Primary database index
.scn	Calgari trueSpace2 File Format
.trp	Watcom binw file
.txt	many Dos Text editors used this extension
.w00	Archive file
.y	Bitmap image (subsampled raw YUV )

.#ib	Printer data file
.#01 - #99	Scanned picture files
.ass	File
.axd	Re-Index file
.cam	Minolta CAM file
.cbs	MasterWord button bar configuration
.com	Mime: application/octet-stream
.csa	Comma Delimited textfile
.db	ANSYS Database
.doc	MS DOS Word2x,3x,.. Formatted text, mixed ascii and binary
.img	Alias Research, Vivid ray-tracer : Bitmap graphics (24bit RLE)
.ll	Preview file List&Label LLVIEW.exe (combit GmbH)
.mid	MIDI-sequention sound
.mng	Multiple-image Network Graphics bitmap image
.mpc	Ms Project Calendar file
.org	Lotus Organizer calendar
.pbp	Perl Builder file
.pla	ArchiCAD Archive
.pqi	Mime: application/cprplayer
.psm	Protracker Studio Module (sound)
.pwi	PDA file, Windows CE file format
.rg	Bitmap image (1bit B&W 4bit CMYK) (Raster Graphics format)
.rnd	PGP Random Seed
.rtf	Mime: text/rtf
.sat	ACIS 2D/3D : Vector graphics / CAD
.sbx	Adobe Illustrator Tsume
.smf	StarOffice Formula
.wb	Game: fifa2000 be file
.wd	InfoSelect data file
.wk3	Lotus 1-2-3 version 3 spreadsheet
.zl1	AAICWpro/ZoneAlarm Mailsafe renamed File = .adp
.3d	Atari Stereo CAD-3D objects graphics format
.r32	RAR compressed files from a multi-volume archive
.amv	Unknown or unassigned file extension.
.anf	ANSYS DesignModeler file format.
.f95	Fortran 95 language source file
.hp2	Unknown or unassigned file extension.
.klx	Unknown or unassigned file extension.
.otd	Unknown or unassigned file extension.
.pym	Unknown or unassigned file extension.
.rfw	Unknown or unassigned file extension.
.ulb	Unknown or unassigned file extension.
.vr8	Unknown or unassigned file extension.
.wkp	Web CEO database backup file
.xm3	Unknown or unassigned file extension.
.ytf	Unknown or unassigned file extension.
.ziz	Unknown or unassigned file extension.
.zpt	Zope page template
.#$4	Unknown or unassigned file extension.
.#$5	Unknown or unassigned file extension.
.stuff	A jokey file extension used by the authors of the game black and white II
.pod	PodFlow Project file
.csa	Documents archive
.#sc	Printer data file
.abm	Album
.ai	Mopac Internal chemical modeller output file
.bcc	Borland c++ file/makefile
.bin	Micrografx Designer 7 Project Image
.bin	Mime: application/macbinary
.bix	BIX compressed file archive
.bn	AdLib Instrument Bank file
.c4	Edmics image format
.dbd	DemoShield Player
.dbf	dBASE Act!
.dbf	Oracle 8.x Tablespace File
.dgc	TurboTax File
.dl	Display - DL Viewer : Animation
.dot	Corel Lines-Definition
.dot	Mime: application/msword
.dpp	Serif DrawPlus Drawing
.ds	TWAIN Data Source ( = DLL)
.dwg	2d Graphic
.enc	MPEG Video; video/mpeg; (MOV | Encore sound )
.f	Freeze compressed file archive
.flm	Film Roll (AutoCAD/AutoShade)
.fp5	FileMaker Pro 5 File
.i01	Winphone phonebook
.ico	Windows 3.x/95/NT Icon Resource
.ja	IBM tools updater file
.jbk	Juno Backup File
.kml	Win48 script (HP48 emulator)
.ko	IBM/tools/updater file
.m	MatLab function & commands
.mam	Database Program MS Access Macro
.mhtml	MHTML document
.mus	Music file format
.mvb	Microsoft Media Viewer document; display with MVIEWER.EXE or MVIEWER2.EXE.
.ntx	Clipper database index
.osp	CWCDATA file
.pat	AutoCAD Hatch Pattern
.pmd	AdobePagemaker file
.rsm	Resume file (WinWay Resume Writer)
.sig	gen. Current program settings = Signature
.smf	SMARTFAX : Fax
.spp	Serif PhotoPlus Native Format File
.srf	Sun Raster File : Bitmap graphics
.txt	Mime: application/text
.vce	Cool Edit NMS file, audio editor file
.zl9	AAICWpro/ZoneAlarm Mailsafe renamed File = .exe
.gho	Norton Ghostback file

.sig	gen. Current program settings = Signature
.smf	SMARTFAX : Fax
.spp	Serif PhotoPlus Native Format File
.srf	Sun Raster File : Bitmap graphics
.srv	Help Maker file
.t	Paradox database file
.vce	Cool Edit NMS file, audio editor file
.zl9	AAICWpro/ZoneAlarm Mailsafe renamed File = .exe
.gho	Norton Ghostback file
.gdb	Some database file
.004	Compressed archive file
.bgy	Unknown or unassigned file extension.
.cf1	Common File format 1
.dvn	Unknown or unassigned file extension.
.gul	Unknown or unassigned file extension.
.h3r	Unknown or unassigned file extension.
.kge	Unknown or unassigned file extension.
.l7a	Unknown or unassigned file extension.
.mvk	Unknown or unassigned file extension.
.nrl	Unknown or unassigned file extension.
.rra	Unknown or unassigned file extension.
.sxv	Unknown or unassigned file extension.
.ts_	Unknown or unassigned file extension.
.vvi	Unknown or unassigned file extension.
.w3m	Warcraft 3 Map file
.xzv	Unknown or unassigned file extension.
.zmc	Unknown or unassigned file extension.
.#$6	Unknown or unassigned file extension.
.#&-	Unknown or unassigned file extension.
.aca	Animation
.asc	Ascent is an australian CASE design tool.
.asc	Transport armored file
.asx	Video file
.cache	Snacc-1.3 vda file
.cbf	Chess Base
.cit	Intergraph Scanned Image
.cvf	SuperStor compressed volume
.dba	Turbo Prolog - DataEase : Database
.dbf	Enable database : can be opened with Excel 97
.dbf	MS Query database file
.dg	Auto-trol Vector : Vector graphics
.drw	Drawing (various)
.dst	CubicPlayer file
.ebo	Microsoft Reader Ebook Format
.edw	eDrawings SolidWorks Corp
.eps	Mime: application/postscript
.fcw	Campaign Cartographer 2 File
.icd	IronCAD 2D CAD File
.icns	Icon file
.jp2	JPEG-2000 JP2 File Format image format
.log	Mime: text/plain
.lsm	Film LOTUS
.map	Geography maps
.mcx	Mastercam X and X2 file format
.mi	Mime: application/x-mif
.mts	Mime: application/metastream
.nth	Imagemagick-5.3.2 Visualmagick jbig file
.ocx	OLE Custom Control, 32 bit (Visual Basic or C++) ActiveX control
.oft	Microsoft Outlook template
.p7b	SPC File , cryptografic certificate
.par	Digitalk PARTS : Parts application
.par	Fractint : Parameter file
.php	PhotoDeluxe PhotoParade Album
.pps	Paint Shop Pro image
.pqi	PowerQuest : Drive image file
.qpw	Quattro Pro file
.r	Fortran preprocessor Source RatFor
.r	Paradox file
.rap	Magix Musstu Rap file
.rep	REPort file made by several programs
.sis	Mime: application/vnd.symbian.install
.sit	Mime: application/x-sit
.so	Shared library file (Unix)(similar to DLL)
.sp	ZX SPECTRUM emulator source profile
.stp	ISO-10303 STEP product data
.svg	Mime: image/svg-xml
.tgq	Bullfrog Software : Movie (Dungeon Keeper 2)
.tmd	Lotus TvMap Document
.trs	Micrografx executable file
.upg	Grafik Anim file
.wb?	Quattro Pro spreadsheet (?=version)
.wmf	Mime: windows/metafile
.x	X-file animation (Direct3D) (DeepV2)
.xls	Mime: application/vnd.ms-excel
.xsr	Mime: video/x-amt-showrun
.ghs	Tarshare file
.gpi	Bitware Fax file
.inp	Interdependance description file
.r40	RAR compressed files from a multi-volume archive
.dc4	Unknown or unassigned file extension.
.eea	Encrypted E-mail Attachment
.esb	Unknown or unassigned file extension.
.fni	Unknown or unassigned file extension.
.gvp	Unknown or unassigned file extension.
.gzi	Unknown or unassigned file extension.
.hmk	Unknown or unassigned file extension.
.jg0	Unknown or unassigned file extension.
.mbb	Unknown or unassigned file extension.
.opd	Unknown or unassigned file extension.
.pqe	Unknown or unassigned file extension.

.sv$	Unknown or unassigned file extension.
.to5	Unknown or unassigned file extension.
.vsr	Unknown or unassigned file extension.
.zi-	Unknown or unassigned file extension.
.#$e	Unknown or unassigned file extension.
.#$8	Unknown or unassigned file extension.
.0#5	Unknown or unassigned file extension.
.acct	Describes the format of the records in the system accounting files.
.adp	Dynamic Page file (AOLserver)
.001-999	Database index file
.art	Image
.as	Applix Spreadsheet file
.axe	Map
.bc3	(make-)file for Bcc 3
.bin	Mime: application/mac-binary
.bin	Mime: application/octet-stream
.bkf	msbackupfile open with: ntbackup.exe
.blb	DreamWorks Resource Archive
.bmp	Mime: image/x-windows-bmp
.btr	Btrieve Database File
.c	Check Point Site Configuration
.cds	Format on a copy protected CD ????
.css	Internet HTML Cascading Style Sheet
.csv	CompuShow adjusted EGA/VGA palette
.d	ChemDraw Conn. Table chemical modeller output file
.d01	Tonline Db file
.db	data by Paradox
.db	WindowsXP Thumbnail Database
.dcr	Delphi Component Resource (binary resource)
.doc	DisplayWrite 4
.dsn	Design (Object System Designer)
.dta	Stata
.dvd	DOS Device Driver File
.eds	Ensoniq SQ80 disk image
.exo	System file
.fbc	FamilyTree Compressed Backup File
.h	Header File normally with .C or .CPP file
.ics	Outlook Calendar File
.iges	Draft for IGES 5.x
.ipt	AutoDesk Inventor Part
.ird	Ird Append file
.jtf	Hayes JT Fax : Fax
.kml	Kedit Macro Library
.m14	Steuer2001 file
.mav	MS Access View Shortcut
.mfl	WINXP SYSTEM32 WBEM file
.mht	Mime: message/rfc822
.mhtm	MHTML (mime html-)document
.mo	Modula-3 object file
.msg	MeSsaGe text
.mva	Archive; Used by MS some setup programs
.ndx	dBase Index (generally database index)
.net	gen. Network configuration/info file
.pcr	image format
.pdg	Print Shop Deluxe : Data
.psd	Mime: application/octet-stream
.pst	MS Outlook Personal Folder File
.ptb	Pro/Engineer : Table file
.ptn	Amaya dicopar file
.pub	Publication (PageMaker/Ventura Publisher/1st Publisher)
.r	Macintosh Resource similar to RC
.raw	HSI Raw image format
.rbi	Adressmn file
.sdf	System Data Format file (fixed lenght ascii text)
.slddwg	SolidWorks drawing 2D (Vector graphics)
.tps	WN16 DICT file
.txt	Mime: text/plain
.wfc	War FTP client file
.x	Lex language source code
.xml	Mime: application/xml
.!c	ZX Spectrum Hobetta picture format
.s	Train Simulator Shape File
.dt7	Unknown or unassigned file extension.
.exb	Unknown or unassigned file extension.
.fgc	Unknown or unassigned file extension.
.hmt	Unknown or unassigned file extension.
.hyn	Unknown or unassigned file extension.
.kdr	Unknown or unassigned file extension.
.mc9	Mastercam V9 file format
.pun	Unknown or unassigned file extension.
.sbg	Unknown or unassigned file extension.
.sgz	Unknown or unassigned file extension.
.vse	Unknown or unassigned file extension.
.vs4	Unknown or unassigned file extension.
.xef	Unknown or unassigned file extension.
.xmd	Unknown or unassigned file extension.
.#&$	Unknown or unassigned file extension.
.934	Unknown or unassigned file extension.
.s3d	Philips 3D Solutions 3D Displays that show 3D content
.tab	Native file format of MapInfo
.qxp	QuickCreate Pro Course Customiser
..0	Compressed harddisk data file
.acb	Compressed file archive
.am	Applix SHELF Macro
.ac3	Dolby 5.1 channel sound format file
.arv	File
.b!k	Game: Scenery file
.bin	Mime: application/x-macbinary
.bsa	BSArc compressed file archive
.bt	virual terrain software