file extension Windows/OS2/Apple/Unix/Dos

File ExtensionsWindows/OS2/Apple/UNIX

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X = Alysis SuperDisk self-extracting archive
X = Lex language source code
X = Microsoft Direct-X SDK
X = Stardent AVS X bitmap image (24bit)
X = X-file animation (Direct3D) (DeepV2)
X = X1 archive
X = XYZ chemical modeller output file
X-PNG = Mime: image/png
X01 = Paradox secondary index file
X02 = Paradox secondary index file
X03 = Paradox secondary index file
X04 = Paradox secondary index file
X05 = Paradox secondary index file
X06 = Paradox secondary index file
X07 = Paradox secondary index file
X08 = Paradox secondary index file
X09 = Paradox secondary index file
X10 = Bitmap image (X Window dump)
X11 = Bitmap image (X Windows system window dump)
X16 = Macromedia Extra document (16 -bit program extension)
X20 = Xtree (gold) Dos help file
X32 = Macromedia Extra document (32 -bit program extension)
X3D = Mime: application/vnd.hzn-3d-crossword
X3D = x3d and xdart formats
X3F = Photoshop.CameraRawFileFoveon.10 open with: "%ProgramFiles%\Adobe\Adobe Photoshop CS3\Photoshop.exe" "%1" PerceivedType Image PerceivedType Image Content Type application/vnd.ms-wpl
X40 = Xtree (gold) Dos help file
X4M = TeamLinks Mail File Data
X5 = Rockwell Software Logix 5 File
X50 = Xtree (gold) Dos help file
X60 = Xtree (gold) Dos help file
X70 = Xtree (gold) Dos help file
X80 = Xtree (gold) Dos help file
X90 = Xtree (gold) Dos help file
XA = Sony Playstation audio files
XA0 = Xtree (gold) Dos help file
XAB = Microsoft Mail address book
XAF = Active VRML
XAML = Windows.XamlDocument open with: "%Root%\WINDOWS\system32\PresentationHost.exe" "%1" %* Content Type application/xaml+xml
XAML = Windows.XamlDocument open with: "%Root%\WINDOWS\system32\PresentationHost.exe" "%1" %* PerceivedType Image PerceivedType Image Content Type application/xaml+xml
XAML = Windows.XamlDocument open with: "%WinDir%\System32\PresentationHost.exe" "%1" %* Content Type application/xaml+xml
XAML = Windows.XamlDocument open with: "%WinDir%\system32\PresentationHost.exe" "%1" %* PerceivedType image Perceived Type text Content Type application/xaml+xml
XANN = XANN Packer format (music/sound)(Asle / ReDoX)
XAR = Corel Xara drawing
XAR = Mime: application/vnd.xara
XB0 = Xtree (gold) Dos help file
XBAP = Windows.Xbap open with: "%Root%\WINDOWS\system32\PresentationHost.exe" "%1" %* Content Type application/x-ms-xbap
XBAP = Windows.Xbap open with: "%Root%\WINDOWS\system32\PresentationHost.exe" "%1" %* PerceivedType Image PerceivedType Image Content Type application/x-ms-xbap
XBAP = Windows.Xbap open with: "%WinDir%\System32\PresentationHost.exe" "%1" %* Content Type application/x-ms-xbap
XBAP = Windows.Xbap open with: "%WinDir%\system32\PresentationHost.exe" "%1" %* PerceivedType image Perceived Type text Content Type application/x-ms-xbap
XBD = Mime: application/vnd.fujixerox.docuworks.binder
XBF = Data base file
XBM = Mime: image/x-xbitmap
XBM = Mime: image/x-xbm
XBM = Mime: image/xbm
XBM = X Windows system BitMap image
XBN = cygnus ld-scripts file
XBW = Crossword
XB~ = compressed Ic file
XC = Bitmap image (X server screen)
XC0 = Xtree (gold) Dos help file
XCB = CommandBarsDesigner.Document open with: %ProgramFiles%\CODEJO~1\MFC\XTREME~1.1\Utils\COMMAN~1.EXE "%1"
XCEL = (MAC CREATOR CODE) Excel 1 (PC ext: XLS)
XCEL = (MAC CREATOR CODE) Excel 4 (PC ext: XLS)
XCEL = (MAC CREATOR CODE) Excel 5 (PC ext: XLS)
XCEL = (MAC CREATOR CODE) Excel 6
XCEL = (MAC FILE_TYPE) MS Excel
XCF = Gimp Bitmap image format
XCK = Extended crack file (usually text)
XCL = Xtree for Win script
XCOF = (MAC FILE_TYPE) Mac OS Object Library
XD = Ccs-lib.2 Examples Motif-cc file
XD0 = Xtree (gold) Dos help file
XDCT = (MAC FILE_TYPE) XPress Dictionary
XDE = Tgif-3.0 file
XDF = Extended disk format image (OS/2 xdfcopy.exe)
XDL = XML Schema file
XDM = Mime: application/x-xdma
XDM = X-Windows Dump
XDMA = Mime: application/x-xdma
XDO = Animation Formula Graphics
XDOC = (MAC FILE TYPE) Xpress (all versions) (PC ext: QXD)
XDOC = (MAC FILE TYPE) Xpress file
XDOC = (MAC FILE_TYPE) XPress 3 Layout
XDOC = Xerox ScanWorX and Textbridge OCR File Format (Word)
XDP = AcroExch.XDPDoc open with: "%ProgramFiles%\Adobe\Reader 8.0\Reader\AcroRd32.exe" "%1" Content Type application/vnd.adobe.xdp+xml
XDP = AcroExch.XDPDoc special configuration file for application(binary format) PerceivedType Image PerceivedType Image Content Type application/vnd.adobe.xdp+xml
XDR = Mime: video/x-amt-demorun
XDR = XML data reduced file
XDW = Mime: application/vnd.fujixerox.docuworks
XE0 = Xtree Dos help file
XED = XED chemical modeller input file
XED = XED chemical modeller output file
XEN = Xenu Document open with: XENU.EXE
XEVGENXML = XEV.GenericApp open with: "%ProgramFiles%\Internet Explorer\IEXPLORE.EXE" -nohome
XEVGENXML = XEV.GenericApp open with: "%ProgramFiles%\Internet Explorer\iexplore.exe" -nohome
XFDF = AcroExch.XFDFDoc open with: "%ProgramFiles%\Adobe\Acrobat 5.0\Reader\AcroRd32.exe" "%1" Perceived Type text Content Type application/vnd.adobe.xfdf
XFDF = AcroExch.XFDFDoc open with: "%ProgramFiles%\Adobe\Reader 8.0\Reader\AcroRd32.exe" "%1" Content Type application/vnd.adobe.xfdf
XFDF = AcroExch.XFDFDoc special configuration file for application(binary format) PerceivedType Image PerceivedType Image Content Type application/vnd.adobe.xfdf
XFDL = Mime: application/vnd.xfdl
XFI = Latex Figures file
XFM = Cooledit 1.50 file
XFM = Coolwave 2000 file
XFN = Printer font (Xerox 4045) (Ventura Publisher)
XFR = Ventura Publisher bitmap editor font file
XFT = 24 pin printer font (ChiWriter)
XFX = Fax File (various)
XG0 = Database Index; Paradox secondary index; see YG0; changes to XG1
XG1 = Database Index; Also XG2, XG3...
XG2 = Database Index; Also XG3...
XG3 = Database Index; Also XG4...
XGL = MegaBitz graphics language file
XGS = XACT.xgs.File open with: "%Root%\directx\directx10\Microsoft DirectX SDK (November 2008)\Utilities\Bin\x86\XACT3.exe" "%1"
XGZ = MegaBitz vector drawing
XGZ = Mime: xgl/drawing
XHT = FirefoxHTML open with: "%ProgramFiles%\Mozilla Firefox\firefox.exe" -requestPending -osint -url "%1" PerceivedType image Perceived Type text Content Type application/xhtml+xml
XHT = FirefoxHTML open with: %Root%\PROGRA~1\MOZILL~1\FIREFOX.EXE -requestPending -osint -url "%1" Content Type application/xhtml+xml
XHT = xhtfile special configuration file for application(binary format) Perceived Type text Content Type application/xhtml+xml
XHTML = Libxml Html file
XI = Fastracker 2.0 instrument file
XIF = eXtended Image File Format
XIF = Mime: image/vnd.xiff
XIF = Xerox DIFF image format
XIM = X11 Xim Toolkit bitmap
XIP = HP95 Execute-in-place program (modified EXE/like com)
XL = Mime: application/excel
XL = Ms Excel spreadsheet
XL$ = Modem Bitware Fax disk2 file
XLA = Mime: application/excel
XLA = Mime: application/vnd.ms-excel
XLA = Mime: application/x-excel
XLA = Mime: application/x-msexcel
XLA = Ms eXceL Addin macro sheet
XLA = Xlib Archive (Xlib graphics library)
XLA5 = (MAC FILE_TYPE) Excel 5
XLA8 = (MAC FILE_TYPE) Excel 98 Add-in
XLA_ = (MAC FILE_TYPE) Excel 4 Add-In
XLAM = Excel.AddInMacroEnabled open with: "%ProgramFiles%\Microsoft Office\Office12\EXCEL.EXE" /e Content Type application/vnd.ms-excel.addin.macroEnabled.12
XLAM = Excel.AddInMacroEnabled open with: "%ProgramFiles%\Microsoft Office\Office12\EXCEL.EXE" /e PerceivedType Image PerceivedType Image Content Type application/vnd.ms-excel.addin.macroEnabled.12
XLB = Mime: application/excel
XLB = Mime: application/vnd.ms-excel
XLB = Mime: application/x-excel
XLB = Ms ExceL Spreadsheet
XLB4 = (MAC FILE_TYPE) Excel 4 Toolbar
XLB5 = (MAC FILE_TYPE) Microsoft Toolbar
XLB8 = (MAC FILE_TYPE) Excel 8 Toolbar
XLBN = (MAC FILE TYPE) Excel 1 (PC ext: XLS)
XLBN = (MAC FILE TYPE) Excel 1 spreadsheet
XLBN = (MAC FILE_TYPE) Lotus 1-2-3 Worksheet
XLC = Microsoft Excel chart
XLC = Mime: application/excel
XLC = Mime: application/vnd.ms-excel
XLC = Mime: application/x-excel
XLC3 = (MAC FILE_TYPE) Excel 3 Chart
XLC4 = (MAC FILE_TYPE) Excel 4
XLC_ = (MAC FILE_TYPE) Excel 2.2 Chart
XLD = Microsoft Excel dialogue
XLD = Mime: application/excel
XLD = Mime: application/x-excel
XLDE = (MAC FILE_TYPE) Dialog Edito
XLG = Xnetech Engraving Logo File
XLK = Microsoft Excel backup
XLK = Mime: application/excel
XLK = Mime: application/x-excel
XLL = Microsoft Excel add-in
XLL = Mime: application/excel
XLL = Mime: application/vnd.ms-excel
XLL = Mime: application/x-excel
XLL_ = (MAC FILE_TYPE) Excel 4 Add-In
XLM = Microsoft Excel macro
XLM = Mime: application/excel
XLM = Mime: application/vnd.ms-excel
XLM = Mime: application/x-excel
XLM3 = (MAC FILE_TYPE) Excel 3 Macro
XLM4 = (MAC FILE_TYPE) Excel 4
XLM_ = (MAC FILE_TYPE) Excel 2.2 Macro
XLPF = (MAC FILE_TYPE) Excel Setting File
XLR = MS Works File
XLS = Microsoft Excel worksheet
XLS = Mime: application/excel
XLS = Mime: application/vnd.ms-excel
XLS = Mime: application/x-excel
XLS = Mime: application/x-msexcel
XLS3 = (MAC FILE TYPE) Excel 3 spreadsheet
XLS3 = (MAC FILE_TYPE) Excel 3 Spreadsheet
XLS4 = (MAC FILE TYPE) Excel 4 (PC ext: XLS)
XLS4 = (MAC FILE TYPE) Excel 4 spreadsheet
XLS4 = (MAC FILE_TYPE) Excel 4
XLS5 = (MAC FILE TYPE) Excel 5 (PC ext: XLS)
XLS5 = (MAC FILE_TYPE) Excel 5
XLS8 = (MAC FILE_TYPE) Excel 98 Spreadsheet
XLS_ = (MAC FILE TYPE) Excel 2.2 spreadsheet
XLS_ = (MAC FILE_TYPE) Excel 2.2 Spreadsh
XLSB = Excel.SheetBinaryMacroEnabled.12 open with: "%ProgramFiles%\Microsoft Office\Office12\EXCEL.EXE" /e PerceivedType document PerceivedType document Content Type application/vnd.ms-excel.sheet.binary.macroEnabled.12
XLSHTML = Excelhtmlfile open with: "%ProgramFiles%\Microsoft Office\Office10\EXCEL.EXE"
XLSHTML = Excelhtmlfile open with: "%ProgramFiles%\Microsoft Office\Office12\EXCEL.EXE"
XLSM = Excel.SheetMacroEnabled.12 open with: "%ProgramFiles%\Microsoft Office\Office12\EXCEL.EXE" /e PerceivedType document PerceivedType document Content Type application/vnd.ms-excel.sheet.macroEnabled.12
XLSMHTML = excelmhtmlfile special configuration file for application(binary format)
XLSX = Excel.Sheet.12 open with: "%ProgramFiles%\Microsoft Office\Office12\EXCEL.EXE" /e PerceivedType document PerceivedType document Content Type application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
XLT = Microsoft Excel template
XLT = Mime: application/excel
XLT = Mime: application/vnd.ms-excel
XLT = Mime: application/x-excel
XLT = Translation table (Lotus 123/Symphony/Procomm Plus)
XLT = Translation table many prgs
XLTB = (MAC FILE_TYPE) DataViz Translator
XLTHTML = Excelhtmltemplate open with: "%ProgramFiles%\Microsoft Office\Office10\EXCEL.EXE"
XLTHTML = Excelhtmltemplate open with: "%ProgramFiles%\Microsoft Office\Office12\EXCEL.EXE"
XLTM = Excel.TemplateMacroEnabled open with: "%ProgramFiles%\Microsoft Office\Office12\EXCEL.EXE" /e PerceivedType document PerceivedType document Content Type application/vnd.ms-excel.template.macroEnabled.12
XLTX = Excel.Template open with: "%ProgramFiles%\Microsoft Office\Office12\EXCEL.EXE" /e PerceivedType document PerceivedType document Content Type application/vnd.openxmlformats-officedocument.spreadsheetml.template
XLV = Microsoft Excel VBA module
XLV = Mime: application/excel
XLV = Mime: application/x-excel
XLW = Microsoft Excel workbook / workspace
XLW = Mime: application/excel
XLW = Mime: application/vnd.ms-excel
XLW = Mime: application/x-excel
XLW = Mime: application/x-msexcel
XLW3 = (MAC FILE_TYPE) Excel 3 Workbook
XLW4 = (MAC FILE_TYPE) Excel 4
XLW5 = (MAC FILE_TYPE) Excel 5
XLW_ = (MAC FILE_TYPE) Excel 2.2 Workbook
XLXML = Excelxmlss special configuration file for application(binary format)
XM = Cubic Player file
XM = FastTracker 2, Digital Tracker music module (MOD) file
XM = Mime: audio/x-mod
XM = Mime: audio/xm
XM = sound file
XMB = X-Wing Mission Briefing File
XMD = xmd special configuration file for application(binary format)
XMFG = created by MediaForge. See www.mediaforge.com
XMI = Compressed eXtended MIdi music
XML = Internet document; Extensible Markup Language; many prgs even. MS Office later 98
XML = Mime: application/xml
XML = Mime: text/vnd.IPTC.NewsML
XML = Mime: text/vnd.IPTC.NITF
XML = Mime: text/vnd.wap.si
XML = Mime: text/vnd.wap.sl
XML = Mime: text/vnd.wap.wml
XML = Mime: text/xml
XMP = Spice Pspice Lib file
XMS = eXtended Memory Specification (XMS), ver 3.0 Microsoft
XMT = XMT_auto_file open with: TriSpect.exe
XMTA = VisualStudio.xmta.9.0 open with: "%ProgramFiles%\Microsoft Visual Studio 9.0\Common7\IDE\devenv.exe" /dde Content Type application/xml
XMTA = VisualStudio.xmta.9.0 open with: "%ProgramFiles%\Microsoft Visual Studio 9.0\Common7\IDE\devenv.exe" /dde PerceivedType document PerceivedType document Content Type application/xml
XMZ = Mime: audio/x-mod
XMZ = Mime: xgl/movie
XMZ = XGL movie (MegaView)
XN = cygnus ld-scripts file
XNF = Standard Network File form
XNK = Microsoft Exchange shortcut
XNT = Spice Pspice Lib file
XOF = RenderMorphics
XOML = VisualStudio.xoml.9.0 open with: "%ProgramFiles%\Microsoft Visual Studio 9.0\Common7\IDE\devenv.exe" "%1" Content Type text/plain
XOML = VisualStudio.xoml.9.0 open with: "%ProgramFiles%\Microsoft Visual Studio 9.0\Common7\IDE\devenv.exe" "%1" PerceivedType document PerceivedType document Content Type text/plain
XON = Axon datafile
XOS = Xaos Tools bitmap image
XOT = Xnetech Job Output File
XOWN= Xtras files Type "Xtra" Creator "Xown" (MAC)
XP = System Util file
XPF = XPF open with: "%ProgramFiles%\Buhl\Mein Geld\MG.exe" "%1"
XPIX = Mime: application/x-vnd.ls-xpix
XPIX = Nonogram puzzle
XPK = Spice Pspice Lib file
XPL = Xset plugins file
XPM = Mime: image/x-xpixmap
XPM = Mime: image/x-xpm
XPM = Mime: image/xpm
XPM = Unix-X11 PixMap (256 color image for X Windows) (8bit text)
XPP = SqlServerReplication.Xpp special configuration file for application(binary format)
XPR = Mime: application/vnd.is-xpr
XPR3 = (MAC CREATOR CODE) EPS created by Xpress (PC ext: EPS)
XPR3 = (MAC CREATOR CODE) QuarkXpress 3
XPR3 = (MAC CREATOR CODE) Xpress (all versions) (PC ext: QXD)
XPR3 = (MAC FILE_TYPE) QuarkXPress
XPS = backup for xport .sps by sharkport
XPW = Mime: application/vnd.intercon.formnet
XPX = Mime: application/vnd.intercon.formnet
XQT = SuperCalc macro spreadsheet
XQT = Waffle executable
XR = cygnus ld-scripts file
XR1 = Epic MegaGames Xargon game data
XREF = Cross reference file(AIX as)
XRF = Cross Reference
XRM-MS = MSSLLFile open with: "iexplore.exe" "%1" Content Type text/xml
XRS = Realplayer Plugin Extresources file
XSB = XQ-Xsetup backup file
XSC = XML schema
XSD = XML schema description file
XSF = InfoPath.SolutionManifest.2 open with: "%ProgramFiles%\Microsoft Office\Office12\INFOPATH.EXE" "%1"
XSL = Mime: text/xml
XSL = Mime: text/xsl
XSL = Steuer2001 file
XSM = LEXIS-NEXIS Tracker
XSN = InfoPath.Solution.2 open with: "%ProgramFiles%\Microsoft Office\Office12\INFOPATH.EXE" "%1"
XSPF = VLC.xspf special configuration file for application(binary format)
XSR = Mime: video/x-amt-showrun
XSS = VisualStudio.xss.9.0 special configuration file for application(binary format) Content Type application/xml
XST = Tanner Ledit : Crossview data
XSTB = (MAC FILE_TYPE) TextBridge
XSU = Fortran Libf77 file
XSUM = Clapack file
XT = FastTracker music track
XT* = Crosstalk Related File
XTB = LocoScript External Translation TaBle
XTG = Quark Xpress 3.32 tags files
XTMP = (MAC FILE TYPE) Xpress template
XTMP = (MAC FILE_TYPE) XPress 3 Template
XTND = (MAC FILE_TYPE) Acrobat Plug-in
XTP = XTreeGold overlay
XTR = RealArcade Compressed Data File
Xtra = (MAC FILE_TYPE) Flash
XTRa = (MAC FILE_TYPE) Quark Xtra
XTRA = Xtras files Type "Xtra" Creator "Xown" (MAC)
XTRL = (MAC FILE_TYPE) XTND Translator Lis
XU = cygnus ld-scripts file
XUL = XML User Interface Language
XUL = Mime: text/xul
XV = VIFF bitmap image (Khoros Visualization Image File Format)
XVR = Superscape Viscape file
XVU = BOClean Database File
XWB = XACT.xwb.File open with: "%Root%\directx\directx10\Microsoft DirectX SDK (November 2008)\Utilities\Bin\x86\XACT3.exe" "%1"
XWC = Crosstalk for Windows Compiled Script
XWD = Mime: image/x-xwd
XWD = Mime: image/x-xwindowdump
XWD = X Windows window screen dump/bitmap
XWF = Yamaha XG Works
XWI = X-Wing Mission File
XWK = Keyboard mapping (Crosstalk)
XWP = Crosstalk for Windows Phone book
XWP = Xerox Writer document
XWS = Crosstalk for Windows Script
XWZ = Xset wizards file
XX = XXEncoded file (ASCII) (xxdecode/xxencode). 7bit ASCII attachments for email programs that can't handle binary attachments
XXE = XXEncoded file (ASCII) (xxencode). 7bit ASCII attachments for email programs that can't handle binary attachments
XXT = Extension DLL (seldom)
XXX = Sysinfo SA51SWE file
XY = XyWrite document
XY3 = XYWrite III document
XY4 = XY Write IV document
XY4v = XYWrite IV document
XY? = XyWrite document (?=version)
XYP = XY Write III Plus document
XYW = XYWrite for Windows 3x/4.0 document
XYZ = Mime: chemical/x-pdb
XYZ = Mime: chemical/x-xyz
XYZ = Moleculeviewer models file
XYZ = XYZ chemical modeller input file

Search: Use ctrl-F to search for item

Universal dump-utility for non-destructive dump/list/search string etc
dump.zip


Select Extension by starting letter:

A- B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U -

V- W - X - Y - Z - OTHER - Allowed chars in Filenames - what is an extension?

 

If you find an extension missing, write! No guarantee given for completeness or correctness. If you feel an extension is outdated, write!
Authors and retailers: it is in the interest of us all and our customers to avoid the double use of extensions! Please help us keep this compilation up todate!
Send extension data to: update@file-ext.4uj.org
Any questions for not listed extensions or "what program opens xxx": search@file-ext.4uj.org
Any other questions, remarks, praise, flaming or reproach: info@file-ext.4uj.org
Compilation Copyright (c) 2002 R.Bitsch, Compilation Copyright (c) 2009,2010 R.Cooper-Bitsch