Collector: Nosa Lee
Original Address: https://www.seeksunslowly.com/file-extensions-types-references-x
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_____________________________________

Now, I collected all the known file extensions/types for your reference, I grouped them according to the first character due to there are too many file extensions/types.

The following file extensions/types are grouped as X*, to refer to more file extensions/types or download them (a compressed txt file that separates the extension and description with ” : “), please click the following links.

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
Number  Symbol

Download All File Types/Extensions in ONE Compressed File

X   Xview Object
X   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
X   REXX Script (IBM)
X   Stardent AVS X Image
X   LEX Program File
X   Direct3D Object (Microsoft Corporation)
X   Amapi 3D Modeling
X   Alysis SuperDisk Self-extracting Archive
X   FPS Creator Model (The Game Creators Ltd.)
X   XBLite Program File
X01   Paradox Secondary Index
X02   Paradox Secondary Index
X03   Paradox Secondary Index
X04   Paradox Secondary Index
X05   Paradox Secondary Index
X06   Paradox Secondary Index
X07   Paradox Secondary Index
X08   Paradox Secondary Index
X09   Paradox Secondary Index
X1   X1 Desktop Search Saved Search File (X1 Technologies, Inc.)
X10   X Window Dump Bitmap
X11   X Windows System Window Dump Bitmap
X13   Hooligans
X16   Macromedia Program Extension
X28   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
X32   Macromedia Program Extension (Macromedia)
X3D   X3D File (Web3D Consortium)
X3D   Xara 3D Project File (Xara)
X3DB   X3D Binary Format File (Web3D Consortium)
X3DBZ   X3D GZipped Binary Format File (Web3D Consortium)
X3DV   X3D Classic VRML File (Web3D Consortium)
X3DVZ   X3D GZipped Classic VRML File (Web3D Consortium)
X3F   Sigma Camera RAW Picture File (Sigma)
X4M   TeamLinks Mail File Data
X5   Rockwell Software Logix 5 File
X64   C64 Emulator Disk Image
X83   GAEB 2000 XML and DA XML File (Bundesamt f黵 Bauwesen und Raumordnung)
XA   Extended Architecture File
XA   Playstation Video (Sony Corporation of America)
XA   Gear CD Suite File
XA   The Sims Extensive Audio (Electronic Arts (Maxis))
XA2   Exam Editor Question Groups (Nice Productions)
XAB   Mail Address Book (Microsoft Corporation)
XAB   Xenis Mail Address Book
XAC   GNUCash GNUCash Backup File (The GNUCash Project)
XACT   XactScript File (XactCommerce)
XAD   eXotic AdLib Format
XADML   XML-based Application Description Information
XAF   Affirm Transcript Editor Affirm Transcript Editor
XAML   Windows Presentation Foundation Object Model XML-based Markup Language (Microsoft Corporation)
XAN   XANIA Browser
XAN   xyALGEBRA File
XAP   Xbox Dashboard Script (Microsoft Corporation)
XAP   Elonex ONEt+ Application File (Elonex)
XAP   Silverlight Application Package (Microsoft Corporation)
XAR   Corel Xara Drawing
XAR   Xara X Vector Drawing (Xara Group Limited)
XAR   Excel AutoRecover File (Microsoft Corporation)
XAR   eXtensible ARchiver Archive
XARC   The Longest Journey Sound File (Funcom)
XAS   Playstation Video (Sony Corporation of America)
XBA   xBase Website Code (Mauricio Fragoso)
XBA   Timespace X200/K200 Digital Video Recorder Video File (Timespace Technology Ltd.)
XBAP   Silverlight Application Package (Microsoft Corporation)
XBE   Xbox Executable (Microsoft Corporation)
XBEL   XML Bookmark Exchange Language (XBEL) File (SIG for XML Processing in Python)
XBF   Database File
XBF   Emperor Battle for Dune
XBIN   RegSupreme License File (Macecraft Software)
XBK   SMART Board Slide Collection (SMART Technologies Inc.)
XBL   XBLite Program File
XBL   Extensible Binding Language
XBM   X Bitmap Graphic
XBP   XBWML X-Bite.co.uk Markup Language (X-Bite.co.uk)
XBS   ETAK MapBase
XBW   Crossword
XBX   XBox Image File (Microsoft Corporation)
XB~   IC File
XC   X Server Constant Screen Image Bitmap
XC2   HPXView DACCS Configuration (Haliplex Communication Systems)
XCD   WarpIN CID (Configuration, Installation, Distribution) File
XCDATAMODEL   Xcode Core Data-based Data Model (Apple Inc.)
XCF   GIMP Image File (The GIMP Team)
XCI   Acrobat Font Mapping File (Adobe Systems Incorporated)
XCK   Extended Crack File
XCL   Xtree for Win Script
XCM   CmapTools Exported Concept Map (IHMC)
XCMD   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
XCMDS   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
XCN   HPXView DACCS Configuration (Haliplex Communication Systems)
XCODEPROJ   Xcode Project (Apple Inc.)
XCP   Xbox Compressed Package (Microsoft Corporation)
XCR   Warlords Battlecry (Strategic Studies Group, Pty Ltd.)
XCS   BuzzLetter Encrypted Stationery Template (StationeryCentral.com, Inc.)
XCT   XVI32 Conversion File (Christian Maas)
XCU   OpenOffice.org Extension Control File (OpenOffice.org Community)
XCZ   BuzzLetter Zipped Collection of Encrypted Stationery Templates (StationeryCentral.com, Inc.)
XD   CCS-lib.2 Examples Motif-CC File
XDB   xText Compiled Database (Flambeaux Software)
XDB   HyperCD HyperLOCK (John Galt Media, Inc.)
XDB   Norton AntiVirus Update File (Symantec Corporation)
XDC   Acrobat Printer Description (Adobe Systems Incorporated)
XDC   DarkCrypTC Encrypted File Container (DarkSoftware (Alexander Myasnikov, Kolchugino))
XDD   xfit XDD Format Data File
XDE   Tgif-3.0 File
XDELTA   Xdelta Binary Differential File
XDF   X68000 Image File
XDF   Extended Disk Format Image
XDF   Milnta APL Transfer Function
XDF   ProWORX Nxt Extended Memory Data (Schneider Electric)
XDF   Workshare Synergy File
XDIM   Multi-Channel Server (MCS) Markup Editor XDIME Document (Volantis Systems Ltd.)
XDK   XML Development Kit Project (Republicorp Virtual Media)
XDO   Oracle BI Publisher Resource Tracking File (Oracle)
XDO   OutDo Outline File (Aspevia Systems)
XDP   Acrobat XML Data Package File (Adobe Systems Incorporated)
XDP   Playstation Media Manager For PSP File (Sony Computer Entertainment Inc.)
XDP   UNIX File
XDQ   Harvest Log File (Hydro-Logic Ltd, Isodaq Division)
XDR   BizTalk XML-Data Reduced Schema (Microsoft Corporation)
XDRUID   XDIME Player Skin (Volantis Systems Ltd.)
XDR_TOR   Insight II Binary Torsion File (Accelrys Software Inc.)
XDS   Nintendo DS Game Maker Project File (Invisionsoft)
XDS   OpenGL Performer Script
XDS   LCDStudio Design (LCDStudio.com)
XDS   Symantec Store Download Manager Partial Download (Symantec Corporation)
XDS   XDS X-ray Detector Software
XDSL   D-Link Router UK Firmware Update File (D-Link Systems, Inc.)
XDT   Xscript Data Packet (Codec Games)
XDW   Milnta APL Transfer Function
XDW   DocuWorks File (Fuji Xerox Co., Ltd.)
XEA   Cryptomax Encrypted Archive (Cryptomax.net)
XEB   Apabi eBook
XEC   Afaria (XcelleNet)
XEE   Expression Encoder Preset File (Microsoft Corporation)
XEF   eManager Form Data (X-Genics Ltd.)
XEJ   Expression Encoder Job File (Microsoft Corporation)
XEL   Expression Encoder Log File (Microsoft Corporation)
XEM   eManager Metering Unit Credits for File Use (XGenics Ltd.)
XEN   Xenu’s Link Sleuth Saved Results File (Tilman Hausherr)
XEP   XenoDream Graphics Data (XenoDream Software, LLC.)
XEP   eManager File Packing Definition (XGenics Ltd.)
XER   Primavera Project Management Propriety Exchange Format (Primavera Systems, Inc)
XES   eManager XML UI Definition for Skins (XGenics Ltd.)
XET   eManager XML Definition of eManager Process (XGenics Ltd.)
XEV   eManager XML Autoupdate Definition (X-Genics Ltd)
XEX   Renamed .EXE File
XEX   Xbox Executable (Microsoft Corporation)
XEX   XeX Web Page Definition
XEX   KERMIT Control File
XEZ   eManager Template Package (X-Genics Ltd.)
XFB   LonMark Binary Device Interface File Format (LonMark International)
XFC   Docuprint N17 Printer Firmware (Xerox)
XFC   X-Fonter Font Collection File (Blacksun Software)
XFD   Atari Disk Image (Atari)
XFD   Acu4GL Extended File Description (Acucorp, Inc.)
XFD   XML Form in XFDL Format
XFDF   Acrobat Forms Document (Adobe Systems Incorporated)
XFDL   XML Form in XFDL Format
XFI   xICE Desktop Encrypted File (Network At Home Enterprises)
XFI   LaTex Figures File
XFL   Flash CS4 Exchange Format (Adobe Systems Incorporated)
XFL   xICE Desktop Encrypted Folder (Network At Home Enterprises)
XFM   OmniForm XML Format
XFM   Audition Transform Effect (Adobe Systems Incorporated)
XFN   Ventura Printer Font
XFO   LonMark Optimized燚evice營nterface燜ile (LonMark International)
XFR   Xfrog Vegetation File (greenworks organic-software)
XFR   Ventura Publisher Bitmap Editor Font File
XFR   Symantec Anti-Virus Corporate Version Failed Update (Symantec Corporation)
XFS   Wolfteam Game File (Softnyx)
XFS   GunBound (Softnyx)
XFS   eRacer Sound File
XFT   ChiWriter 24 Pin Printer Font
XFT   LiveCycle Designer Form (Adobe Systems Incorporated)
XFX   Fax File
XG   XG Encryption Encryption (Mastermind Technology)
XG0   Database Index; Paradox Secondary Index
XG1   Techno Toys XG-909 MIDI Drum Machine File
XG1   Database Index; Also XG2, XG3…
XG2   Database Index; Also XG3, XG4�
XG3   Database Index; Also XG4, XG5�
XG4   Database Index; Also XG5, XG6�
XG5   Database Index; Also XG6, XG7�
XG9   Techno Toys XG-909 MIDI Drum Machine File
XGL   MegaBitz Graphics Language File
XGM   Techno Toys XG-909 MIDI Drum Machine File
XGO   Paradox Database-related File
XGO   LogMate for Windows File
XGO   GeoConcept Add-On (GeoConcept SA)
XGP   PicturePlayer Password Protected Files (PicturePlayer)
XGR   Graph Edit XML Graph (Filter Graph Markup Language) (Microsoft Corporation)
XGS   XACT XACT Global Settings (Microsoft Corporation)
XGS   PicturePlayer Scrambled Files (PicturePlayer)
XGZ   MegaBitz Vector Drawing
XHD   HappyFish XML Data File (ThirstyCrow)
XHDML   XML Version of HDML File
XHESSIAN   Insight II Hessian File (Accelrys Software Inc.)
XHT   Extensible HyperText Markup Language File
XHTM   Extensible HyperText Markup Language File
XHTML   Extensible HyperText Markup Language File
XHTML   Libxml HTML File
XI   ScreamTracker Instrument File
XI   eXtended Instrument
XI   Fast Tracker 2 Instrument
XIA   Chiasmus Encrypted File (Bundesamt f黵 Sicherheit in der Informationstechnik)
XIB   Interface Builder User Interface Resources (Apple Inc.)
XIF   Xerox Image File
XIF   Often a Fax Image (TIFF) File
XIF   [Removed by request] [Removed by request] (ScanSoft, Inc.)
XIF   Wang Image File
XIF   [Removed by request] [Removed by request] (ScanSoft, Inc.)
XIF   LonMark Device Interface File (LonMark International)
XIF   eXtended Image File Format
XIM   X11 Xim Toolkit Bitmap
XIN   OmniMark Include File (Stilo)
XIP   HP95 Execute-in-place Program
XIP   Hotbar Image Compression Format (Skin) (Zango)
XIP   Xbox Dashboard (Microsoft Corporation)
XISE   Xilinx ISE ISE Project File (XILINX)
XIX   IIS NNTP Subject Lists (Microsoft Corporation)
XJS   WinExplorer Java Script
XJT   Compressed GIMP Image with Properties of GIMP
XJTGZ   Compressed GIMP Image with Properties of GIMP
XJTZ2   Compressed GIMP Image with Properties of GIMP
XKS   IBM Softcopy Reader PDF Extended Bookshelf File (IBM)
XL   Excel Spreadsheet (Microsoft Corporation)
XL   Old Amiga Movie Format
XL   XBLite Program File
XL$   Modem Bitware Fax Disk2 File
XLA   Excel Add-in (Microsoft Corporation)
XLA   Data Import aka Dimport Translation Table (DATAIR Employee Benefit Systems, Inc.)
XLA   Xlib Archive
XLAM   Excel Add-In (Microsoft Corporation)
XLAMENX   egis Encrypted XLAM (Excel 2007) File (HiTRUST Inc.)
XLAT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
XLB   Excel Worksheet (Microsoft Corporation)
XLC   Excel Chart (Microsoft Corporation)
XLD   Excel Dialog (Microsoft Corporation)
XLE   Cooktop File
XLF   XLIFF Document
XLF   Crystal Xcelsius Visualization (Business Objects SA)
XLG   Xnetech Engraving Logo File
XLG   AutoCAD XREF Log (Autodesk, Inc.)
XLGC   ExpressK Database File (Prosystech)
XLK   Excel Backup (Microsoft Corporation)
XLL   Excel Add-in (Microsoft Corporation)
XLM   Excel Macro (Microsoft Corporation)
XLNK   XML Link File (Tom Arn)
XLO   Inventor Export Journal (Autodesk, Inc.)
XLR   Works Spreadsheet or Chart (Microsoft Corporation)
XLS   Works Spreadsheet (Microsoft Corporation)
XLS   Excel Worksheet (Microsoft Corporation)
XLSB   Excel Binary Workbook (Microsoft Corporation)
XLSBENX   egis Encrypted XLSB (Excel 2007) File (HiTRUST Inc.)
XLSENX   egis Encrypted Excel XLS File (HiTRUST Inc.)
XLSHTML   Excel HTML Document (Microsoft Corporation)
XLSM   Excel Macro-Enabled Workbook (Microsoft Corporation)
XLSMENX   egis Encrypted XLSM (Excel 2007) File (HiTRUST Inc.)
XLSMHTML   Excel Archived HTML Document (Microsoft Corporation)
XLSX   Excel Microsoft Office Open XML Format Spreadsheet (Microsoft Corporation)
XLSXENX   egis Encrypted Excel Open XML XLSX File (HiTRUST Inc.)
XLSXENX   egis Encrypted XLSX (Excel 2007) File (HiTRUST Inc.)
XLT   Excel Template (Microsoft Corporation)
XLT   Lotus Translation Table (IBM)
XLT   Procomm Plus Translation Table
XLTHTML   Excel HTML Template (Microsoft Corporation)
XLTM   Excel Macro-Enabled Template (Microsoft Corporation)
XLTMENX   egis Encrypted XLTM (Excel 2007) File (HiTRUST Inc.)
XLTX   Excel Template (Microsoft Corporation)
XLTXENX   egis Encrypted XLTX (Excel 2007) File (HiTRUST Inc.)
XLV   Excel VBA (Microsoft Corporation)
XLW   Excel Workspace (Microsoft Corporation)
XLX   XoloX Incomplete Download File
XLXML   Excel XML Worksheet (Microsoft Corporation)
XM   Fast Tracker 2 Extended Module
XM2   TextMap Ver. 2 Case Format File (LexisNexis)
XMAP   File That Controls How XML/XSL Gets Served
XMAS   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
XMB   X-Wing Mission Briefing File
XMC   Expression Media Catalog (Microsoft Corporation)
XMCD   MathCAD XML-based Worksheet (Mathsoft Engineering & Education Inc.)
XMCD   Xmcd CD Information (freedb.org)
XMD   OmniMark Source Code (Stilo)
XMD   GameJack Virtual CD or DVD Image (S.A.D. GmbH.)
XMF   Extensible Music File Format (MIDI Manufacturers Association Incorporated)
XMF   Mobile XMF File Format
XMF   eXtensible Data Model and Format (XDMF)
XMF   Milnta APL Transfer Function
XMFG   MediaForge Runtime Player Distribution Project (XMLAuthor, Inc.)
XMH   XMap Handheld Street Atlas USA Map and Route File (Delorme)
XMI   XML Metadata Interchange Format
XMI   Winamp Extended MIDI File
XMI   EverQuest File
XMI   XMIT File Format (IBM)
XMI   XMill Compressed XML (Dan Suciu, AT&T Labs-Research and Hartmut Liefke, University of Pennsylvania)
XMIT   XMIT File Format (IBM)
XML   Extensible Markup Language File
XMLBACKUP   EnABLE Backup File (Energy Scitech Ltd.)
XMLS   Microsoft Excel 2003 Excel XML File (Microsoft Corporation)
XMN   Expression Media Notepad (Microsoft Corporation)
XMO   Authorware Movie Driver (Adobe Systems Incorporated)
XMP   Graphic File
XMP   Spice Pspice Library File
XMP   XMap Project Data (Delorme)
XMP   Adobe Extensible Metadata Platform (Adobe Systems Incorporated)
XMPCF   TextMap Portable Case Format (LexisNexis)
XMPSES   Premiere Elements DVD Marker File (Adobe Systems Incorporated)
XMPTF   TextMap Portable Transcript Format (LexisNexis)
XMS   ViewCafT XML Markup Session
XMS   RapidCaption Script (PeopleSupport, Inc.)
XMS   XMS-Tracker
XMS   AutoCAD External Message (Autodesk, Inc.)
XMT_TXT   Parasolid CAD File
XMV   Milnta APL Transfer Function
XMX   AutoCAD External Message Compiled File (Autodesk, Inc.)
XMX   Character Set File
XMXP   Help & Manual Uncompressed XML Project (EC Software GmbH)
XMZ   SofTeach Secure Exam File (ExamSoft Worldwide)
XMZ   MegaView XGL Movie
XMZ   Fasttracker 2/Extended Module
XNB   XNA Game Studio XNA Framework Content Pipeline Binary File (Microsoft Corporation)
XNF   Standard Network File Form
XNG   OM2 911 Xchange Version 6 Document
XNG   FishXing Culvert Data File (Stream Systems Technology Center, USDA Forest Service)
XNK   Exchange Shortcut (Microsoft Corporation)
XNML   NML Language Language Extension (NevoSoft)
XNT   Spice Pspice Library File
XNT   W32/Sober-AD
XOF   RenderMorphics
XOI   eZediaMX and eZedia Player Locked Presentation Document
XOM   OmniMark Source Code (Stilo)
XOS   Xaos Tools Bitmap Image
XOT   Xnetech Job Output File
XOV   Rapidform XOV 3D Inspection/Model File (INUS Technology, Inc)
XP   System Utility File
XP3   TVP (Kirikiri) XPK3 Virtual File System (kikyou.info)
XPA   Xpandata DB Transfer Encrypted Compressed File
XPA   SoniqSync Extended Playlist (SoniqCast, LLC)
XPADDERCONTROLLER   Xpadder Controller Layout (Xpadder Team)
XPB   XPB! Basic Source Code (Tony D. Jones)
XPC   ActionReplay Saved Code (Datel Design and Development Ltd.)
XPD   Playstation Download Instruction (DRM) File (Sony Corporation of America)
XPF   Xemod Project File (Xprise Business Solutions BV)
XPF   XaoS Position File (Jan Hubicka, Thomas Marsh, Zoltan Kovacs and Others)
XPF   X-Protector Project (The Xprotector Team)
XPI   Mozilla/Firefox Browser Extension Archive (Mozilla)
XPIX   Nonogram Puzzle
XPJ   Micro Planner X-Pert Project Data File (Micro Planning International Inc.)
XPK   Spice Pspice Library File
XPK   XPK Player Compressed Audio (Data Becker)
XPK   Xscript Package (Codec Games)
XPL   Music File
XPL   LCDStudio Configuration Playlist (LCDStudio.com)
XPL   WinExplorer Simple Script
XPL   X-Plane Plug-In (The House of X-Plane)
XPL   Xset Plug-ins File
XPM   BMC Software Patrol UNIX Icon File
XPM   DESQview Macro (Symantec Corporation)
XPM   X Pixmap Graphic
XPO   X-port Version 1
XPO   Omega Research ProSuite
XPO   Expo Product Tours Project (InstallShield Software Corporation)
XPO   Microsoft Dynamics AX Microsoft Dynamics AX (Microsoft Corporation)
XPP   xCOMPOSER.pro Multimedia Data File
XPR   XBMCTex/Xbox Media Center Graphic File (XboxMediaCenter Project)
XPR   Expression 3 Graphic File (Creature House Ltd.)
XPR   exPresset CD Label (Pressit)
XPS   X-port Version 2
XPS   XML Paper Specification (Microsoft Corporation)
XPS   MonkeyJam Exposure Sheet (David Perry)
XPT   eXact Packager Models (Giunti Interactive Labs S.r.l. (a company of Giunti Publising Group))
XPT   XPCOM Type Library
XPT   Dungeons & Dragons Core Rules 2 (Wizards of the Coast, Inc.)
XPT   SAS Transport (XPORT) Format
XPTHEME   Winstyles Theme (Stardock Corporation, Inc.)
XPTOC   XDIME Player Table of Contents (Volantis Systems Ltd.)
XPW   Accessible FormNet Fillable Form (Intercon Associates Inc.)
XPW   Leading Market Technologies EXPO
XPX   RAFTS-XP Macro File (XP Software Inc.)
XPX   Dungeons & Dragons Core Rules 2 with Expansion (Wizards of the Coast, Inc.)
XPX   XML Format File
XPY   MarketBrowser
XPY   xpy Settings File (Jan T. Sott)
XQL   XML Query Language (XQL) (World Wide Web Consortium)
XQT   Waffle Executable File
XQT   SuperCalc Macro Sheet
XR   Chaos Desktop External Reference File (Chaos systems AB)
XR   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
XR1   Epic MegaGames Xargon File
XRC   wxWidgets wxPython Resource File
XREF   AIX Cross Reference File
XREF   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
XRF   TrialDirector Cross Reference File (inData Corporation)
XRF   Cross Reference
XRF   Crossreference File
XRG   Xscript Game Registry (Codec Games)
XRL   XML R閟um� Library R閟um�
XRL   PowerDesigner Report (Sybase, Inc.)
XRL   Rapidform XOR/XOS 3D Scan Data & CAD File (INUS Technology, Inc)
XRL   OSCAR Rules File
XRM-MS   Microsoft Security Certificate (Microsoft Corporation)
XRNS   Renoise Music File (Multiple Individuals)
XRP   Experior Practice Management Report (Experior Corporation)
XRP   RationalPlan Project File (Stand By Soft)
XRS   Realplayer Plug-in External Resources File (Real)
XRT   Revolution EDX Spectrum Export File in Xraytor Format (4pi Analysis, Inc.)
XRW   Architag XRay XML Editor
XRX   Expression Encoder Media Profile Settings (Microsoft Corporation)
XS   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
xs   Perl xsub File Produced by h2xs
XS   Hummingbird Exceed File
XS3   XESS Worksheet (Applied Information Systems, Inc.)
XS4   XESS Worksheet (Applied Information Systems, Inc.)
XS5   XESS Worksheet (Applied Information Systems, Inc.)
XS8   SIMUL8
XSA   XSA Raw Disk Image (XelaSoft)
XSB   XACT XACT (Microsoft Corporation)
XSB   Sokoban++ Level File
XSC   Transcribe! Transcription Document (Seventh String Software)
XSC   Xscript Script (Codec Games)
XSC   XVI32 Script File (Christian Maas)
XSC   XML Schema
XSD   XML Schema
XSEND   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
XSF   Milnta APL Transfer Function
XSI   Softimage XSI 3D Model (Avid Technology, Inc.)
XSL   XML Stylesheet
XSL   FileMaker Database Design Report Template
XSL   Steuer2001 File
XSLT   XSL Transform File
XSM   LEXIS-NEXIS Tracker
XSN   xyALGEBRA File
XSN   InfoPath Dynamic Form/Template (Microsoft Corporation)
XSO   Expresso Project File (Ultrapico)
XSP   Cross Stitch Professional Design File (DP Software)
XSPF   XSPF Playlist (Xiph.Org Foundation)
XSQL   Oracle XSQL Servlet XSQL Template File (Oracle Corporation)
XSR   GEOPAK XS-List Report (Bentley Systems, Incorporated)
XSS   Ability Office Spreadsheet (Ability Software)
XSS   Cross Stitch Professional Design File (DP Software)
XST   X-Tract XML Script (DecisionSoft Limited)
XST   Easy Cross Cross Stitch Design (DOS Version) (Fulford Software Solutions)
XSTEP   XStep DWI Maker File
XSU   Fortran Libf77 File
XSUM   Clapack File
XSW   Milnta APL Transfer Function
XSWRITER   TechWriter for XML Schemas Document (Adivo Ltd.)
XT   FastTracker Music Track
XT*   Crosstalk Related File
XTB   LocoScript External Translation Table (LocoScript Software)
XTC   XTrkCAD Project (with Remarks)
XTC   XTrkCAD Project
XTD   XML Type Definition
XTEL   Xtelplot File Format
XTG   TreeGraph 2 TreeGraph 2 (BioInfWeb)
XTG   QuarkXPress Tags File (Quark, Inc.)
XTI   Blue Wave offline mail reader Blue Wave offline mail reader (Blue Wave Software)
XTM   Xtremsplit Split Data File
XTM   CmapTools Exported Topic Map (IHMC)
XTML   XML4web Virtual HTML File (Altair Communications Corporation)
XTODVD   ConvertXtoDVD Project File (VSO-Software)
XTP   XTree Data File
XTP   XTrkCAD Demo
XTP   XTrkCAD Parameters
XTP   XTreeGold Overlay
XTP   XTrkCAD Demo (with Remarks)
XTR   RealArcade Compressed Data File
XTS   Babya Desktop Shell System Software Extension
XTS   CSPro File
XTX   xText Source File (Flambeaux Software)
XUF   Milnta APL Transfer Function
XUI   XBox / XBox UI Tool XBox / XBox UI Tool (Microsoft Corporation)
XUL   XML User Interface Language (Mozilla)
XUM   Excel CAPE-OPEN Unit Operation Excel Unit-operation Model (AmsterCHEM)
XUW   Milnta APL Transfer Function
XV   Khoros Visualization Image File
XVB   WinExplorer VB Script
XVC   Verge Compiled Game Code (VERGE Co Ltd)
XVF   Xyngo Video Board Media File (Xyngo AG)
XVG   GROMACS Output File
XVID   XviD CODEC
XVM   VMware Virtual Machine Console (VMware, Inc.)
XVO   ratDVD Internal File (RatDVD – Canada)
XVP   Xview Package File
XVS   Xview Scene Package File
XVU   BOClean Database File
XWB   XACT XACT (Microsoft Corporation)
XWC   Crosstalk for Windows Compiled Script
XWD   X Windows Dump
XWD   Crossdown Puzzle File (Crossdown)
XWF   Declan Software Word File (Declan Software)
XWF   Yamaha XG Works File (Yamaha Corporation of America)
XWI   X-Wing Mission File
XWK   Crosstalk Keyboard Mapping
XWP   Crosstalk for Windows Phone book
XWP   Xerox Writer Text File
XWP   XMLwriter XML Editor Project File (Wattle Software)
XWP   Crosstalk Session
XWS   Crosstalk for Windows Script
XWS   Xara Webstyle File (Xara)
XWV   Reason Malstr鰉 Synth Instrument Patch (Propellerhead Software)
XWZ   Xset Wizards File
XWZ_1   Xteq X-Setup File
XX   Xxencoded File
XX   Arcedit Temporary File
XXA   Brixx Planner Account Detail Chart (Brixx Solutions Ltd.)
XXD   Brixx Planner Calendar File (Brixx Solutions Ltd.)
XXE   Xxencoded File
XXG   Brixx Planner Graph (Brixx Solutions Ltd.)
XXI   GameSpy Arcade (IGN Entertainment, Inc.)
XXL   Archive
XXN   Dimenzo Text Editor Text Document (Dimenzo, Inc.)
XXP   Brixx Planner Plan File (Brixx Solutions Ltd.)
XXR   Brixx Planner Report File (Brixx Solutions Ltd.)
XXS   Sorenson Squeeze Settings File (Sorenson Media, Inc.)
XXT   Extension DLL
XXX   Compucon/Singer PSW Embroidery Design File
XXX   Controlware VJ400 Digital CCTV Recording
XXX   Paint Shop Photo Album Panorama (Corel Corporation)
XXXX   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
XXXXXX   allTunes Partial Download (Mediaservices, Inc.)
XXY   SPARC Executable Script File
XY   XYWrite Text File
XY   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
XY3   XYWrite Text File
XY4   XYWrite IV Document
XY4V   XYWrite IV document
XYD   XYPad 2D CAD File (Coopware)
XYP   XYWrite III Plus Document
XYS   XYplorer Script (Donald Lessau)
XYW   XYWrite Windows 4.0 Document
XYZ   XYZZLY Plug-In for RealPlayer
XYZ   MDL Molfile Co-ordinate Animation Format (MDL Information Systems, Inc.)
XYZ   XMol XYZ
XYZ   Graph Coordinates
XYZ   RPG Maker Graphic Format (Enterbrain, Inc.)
XYZ   F鰎derdiagnose Data File (Bettinger Software)
XYZI   3rdTech Scanner File
XYZRGB   XYZ RGB Graphic (XYZ RGB Inc.)
XZ   XZ Utils Compressed Archive
XZP   XZP Container Format
X_B   Parasolid CAD File
X_T   Parasolid CAD File (UGS Corp.)

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