Windows - Common File Extensions
The following is a list of the most common file extensions and their associated programs. These are the most common, if you don't find what you are looking for here, then check out this link.
http://whatis.techtarget.com/file-extension-list-A/0,289933,sid9,00.html
Word Processors & Text Documents
.DOC - Microsoft Word & WordPad (may also be plain text)
.WPD - Corel WordPerfect & Previous Versions of Novell WordPerfect
.WKS - Microsoft Works
.TXT/.ASC - Plain ASCII text / Unformatted
.PDF - Adobe Acrobat
Spreadsheets
.XLS - Microsoft Excel
.WQ1 - Corel Quatro Pro & Previous Versions of Novell Quatro Pro
.WK1/.WK3/.WK4 - Lotus 1-2-3
.CSV - Comma Seperated Value (standard format)
Graphics Formats
.GIF - Compuserve Graphics Interchange Format
.JPG - JPEG compressed graphics format
.BMP/.DIB - Windows or OS/2 Bitmap
.PCT - PICT format
.TIF - Tagged Image File Format (TIFF)
.PCX - PCX format
.WMF - Windows Meta File
.PS - PostScript
.EPS - Encapsulated PostScript
.CGM - Computer Graphics MetaFile
.PSD - Adobe Photoshop
.AI - Adobe Illustrator
.DXF - AutoCAD Drawing Interchange & almost all CAD applications
Sound & Video formats
.WAV - Windows WAV sound
.AIF - Macintosh AIFF sound
.AU - Sun Audio file
.RA - RealAudio sound
.AVI - Windows Video File
.MOV - Macintosh Quicktime Video
.MPG - MPEG Video format
Archives & Compressed Archives
.ZIP - PKzip/WinZIP compression
.ARJ - ARJ compression
.ARC - ARC compression
.LHA/.LZH - LHA compression (Amiga)
.HQX/.BHX - BinHex compression (Macintosh)
.Z/.GZ - UNIX compression
.TAR - UNIX Tar
.TGZ/.TAZ - DOS contraction of .TAR.GZ or .TAR.Z - See above
.UU/.UUE - UUEncoded document
.B64 - Base 64 (MIME) encoding
.SEA - Self-Extracting Macintosh Archive
Note: WinZIP for the PC or StuffIt for the Macintosh will handle most of these.
System & Misc. Files
.HTM - HTML Code (Hyper Text Markup Language)
.EXE/.COM - Executable File
.BAT - DOS Batch File
.INI - Windows Initialization File
.SYS - System File
.CUR - Cursor
.ICO - Icon
.REG - Registry Patch
.DAT - Registry Data File
.PWL - Password List
last updated 07/27/06