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    File extensions starting with X

    X Lex Language Source Code
    X-PNG Portable (Public) Network Graphic Bitmap
    X01 Corel Paradox Secondary Index
    X02 Corel Paradox Secondary Index
    X03 Corel Paradox Secondary Index
    X04 Corel Paradox Secondary Index
    X05 Corel Paradox Secondary Index
    X06 Corel Paradox Secondary Index
    X07 Corel Paradox Secondary Index
    X08 Corel Paradox Secondary Index
    X09 Corel Paradox Secondary Index
    X1 X1 Desktop Search Saved Search
    X10 X Window Bitmap Dump
    X11 X Window System Bitmap Image
    X13 Hooligans Game Archive
    X20 XTree Gold For Dos Help
    X32 Adobe Xtra Format
    X3A MOTIF XF
    X3D X3D Format
    X3DB X3D Binary Format
    X3DV Web3D X3D Graphics Image
    X3F Sigma Camera RAW Picture Format
    X3G MakerBot MakerWare Document
    X40 XtreeGold Dos Help
    X4K XML4King Configuration Format
    X50 XtreeGold Dos Help
    X60 XTree Gold For Dos Help
    X64 Commodore 64 Emulator Disk Image
    X70 XTree Gold For Dos Help
    X80 Xtree Gold Dos Help
    X90 XTree Gold For Dos Help
    XA Sony PlayStation Audio/video Format
    XA0 Xtree Gold Dos Help
    XAB Microsoft Outlook Express Address Book
    XAC SimCity Societies Game
    XAD EXotic ADlib Sound Format
    XADD Expression Web Add-in
    XADML Amiga Forever XADML
    XAF Xml Compatible Animation Format
    XAIML XAIML Database Format
    XAML Windows Markup File
    XAMLX XAMLX Document Format
    XAN Worms 3D Map Format
    XAP Microsoft Silverlight Application Package Format
    XAPPL Virtual Application Studio XML Application Configuration Format
    XAR Xara Vector Drawing Format
    XARC The Longest Journey Audio
    XAS PTC Pro/Engineer Assembly Format
    XAV Final Draft AV Document
    XAVC Sony XAVC Video Format
    XB0 Xtree Gold Dos Help
    XBA OpenOffice.org Basic Module Format
    XBAP Microsoft Silverlight Application Package
    XBB DVIPDFMx Output
    XBC SMART Notebook Format
    XBD JAXB Schema
    XBDOC Xiosis Scribe Document
    XBE Xbox Executable Format
    XBEL XBEL Bookmarks Format
    XBF Emperor Battle For Dune
    XBK SMART Notebook Format
    XBL Extensible Binding Language Format
    XBLR Output Raw XBRL
    XBM X Windows System Bitmap Image
    XBMML Braille Music Score
    XBMP Area 51 Game
    XBN Xnick Nick Backup
    XBPLATE Xiosis Scribe Template
    XBRL Extensible Business Reporting Language
    XBSAV Mass Effect 2 For Xbox Saved Game Format
    XBT SMART Notebook Template Format
    XBX Xbox Icon Or Picture
    XC0 Xtree Gold Dos Help
    XC3 Cast3D 3D Scene
    XCAPPDATA Apple Xcode Application Data Format
    XCARCHIVE Xcode Archive
    XCCONFIG Apple Xcode Configuration Settings
    XCDATAMODEL Xcode Core Data Model Format
    XCDATAMODELD Xcode Core Data Model Format
    XCEL Microsoft Excel For Mac Spreadsheet
    XCF GIMP XCF Bitmap Image Format
    XCH LinkAssistant Project Settings
    XCI Adobe Reader Font Mapping
    XCL XTree For Windows Script
    XCM CmapTools Exported Concept Map
    XCO Xilinx CORE Generator Log
    XCODE Xcode Development Project Format
    XCODEPLUGIN Apple Xcode Extension
    XCODEPROJ XCode Project Format
    XCOF Mac OS Object Library
    XCON Conceal Encrypted Data
    XCORPUS Xaira Corpora
    XCP XLNT Script Command
    XCPLUGIN Apple Xcode Extension
    XCPLUGINDATA Xcode Plug-in Data
    XCR Warlords Battlecry Game
    XCSCHEME Apple Xcode Scheme
    XCSL CineStyle Color Correction Settings Format
    XCSNAPSHOTS Xcode Snapshot
    XCT XVI32 Conversion
    XCTL LabVIEW XControls
    XCU OpenOffice.org Extension Control Format
    XCUSERSTATE Xcode
    XCWORKSPACE Xcode Workspace Format
    XD0 XtreeGold Dos Help
    XDA Sencha Architect Project
    XDB Norton AntiVirus Update Format
    XDC Total Commander With DarkCrypt IV Plug-in Encrypted
    XDF Externally Defined Function
    XDFL XDFL Configuration
    XDI WinArchiver Compressed ISO Image Format
    XDL MS SQL Server XML Schema Format
    XDO Oracle BI Publisher Resource Tracking
    XDOC QuarkXPress 3.0 Document
    XDOCLET JBoss XDoclet Reference
    XDP Acrobat XML Data Package Format
    XDR XML Data Reduced Format
    XDS LCDStudio Design Format
    XDT Win-Test Extra Data
    XDU Backdoor.Win32.PcClient.xdu
    XDV XeTeX
    XDW DocuWorks Document Format
    XE0 XtreeGold Dos Help
    XEF X-Genics EManager Form Data Format
    XEJ Microsoft Expression Encoder Job Format
    XEL Microsoft Expression Encoder 3.0 Live Jobs Format
    XEM Sybase PowerDesigner Model Definition Format
    XEN Activision Guitar Hero 3 Data Format
    XENSEARCH XenCenter Saved Search Format
    XEO Signwave Auto-Illustrator Extension
    XEP EManager File Packing Definition
    XEQ Sage MAS 90 Data
    XER Primavera Project Management Propriety Exchange Format
    XES X-Genics EManager Skins Definition
    XESC Microsoft Expression Encoder Screen Capture Format
    XET X-Genics EManager Process Definition
    XEV X-Genics EManager Auto-update Format
    XEVGENXML Adobe Dreamweaver
    XEX Xbox 360 Executable Format
    XEZ X-Genics EManager Template Package
    XFA OneCncXR CAD
    XFBIN Naruto Shippuden: Ultimate Ninja Storm 2
    XFC X-Fonter Font Collection
    XFD Adobe XFDL Format XML Form Format
    XFDF Adobe Acrobat Forms Document
    XFDL XFDL Format
    XFF XFRX Database Output
    XFI XICE Desktop Encrypted
    XFL Adobe Flash Exchange Format
    XFM OmniForm XML
    XFN Corel Ventura Printer Font
    XFO XSL-FO Formatted Form
    XFP Microsoft SharePoint Extending Form Library Properties
    XFR Ventura Publisher Bitmap Editor Font Format
    XFS Gunbound Format
    XFT Adobe Form Designer Form
    XFZ French FlashCards Vocabulary
    XG0 Corel Paradox Secondary Index
    XG1 Corel Paradox Secondary Index
    XG2 Corel Paradox Secondary Index
    XG3 Corel Paradox Secondary Index
    XG4 Corel Paradox Secondary Index
    XG5 Corel Paradox Secondary Index
    XGA Diamond Mind Baseball Game Account Information
    XGD Xbox 360 Game Disc Layout
    XGL XGL 3D CAD Model
    XGLL EASE SpeakerLab Text
    XGML Graph Modeling Language XML Format
    XGMML XGMML Graph Format
    XGO GeoConcept Add-on
    XGP Xfire Profile Patcher Game List Format
    XGS Disk Image Format
    XHB HomeBank Data
    XHP OpenOffice.org Extension Help Format
    XHT Extensible HyperText Markup Language Format
    XHTM Extensible HTML Format
    XHTML Extensible HTML Format
    XI Fastracker 2.0 Instrument Format
    XIB Apple Interface Builder Format
    XIF ScanSoft Pagis Format
    XIG XML Instance Generator
    XIL Xilize
    XILINC Xilize Defintion
    XILIZE Xilize Configuration
    XIM X11 Xim Toolkit Bitmap
    XIN OmniMark Include
    XIP Xbox Dashboard
    XISE Xilinx ISE Project Format
    XISO Xbox ISO
    XIT SpatialAnalyzer
    XIT64 SpatialAnalyzer
    XIX IIS NNTP Subject Lists
    XIZ Ximinez
    XJB OEPE JAXB Wizard Bindings
    XJT Compressed GIMP Image
    XKM X KeyBoard
    XL Microsoft Excel Spreadsheet Format
    XLA Microsoft Excel Add-in Format
    XLA5 Microsoft Excel 5 For Mac Add-in
    XLA8 Microsoft Excel 98 For Mac Add-in
    XLAM Microsoft Excel 2007/2010 Open XML Macro-enabled Add-in Format
    XLAMENX Egis Encrypted Excel XLAM
    XLA_ Microsoft Excel 4 For Mac Add-in
    XLB Microsoft Excel Toolbars Format
    XLB4 Microsoft Excel 4 For Mac Toolbars
    XLB5 Microsoft Excel 5 For Mac Toolbars
    XLB8 Microsoft Excel 98 For Mac Toolbars
    XLBN Microsoft Excel 1 For Mac Toolbars
    XLC Microsoft Excel Chart Format
    XLC3 Microsoft Excel 3 For Mac Chart
    XLC4 Microsoft Excel 4 For Mac Chart
    XLC_ Microsoft Excel 2 For Mac Chart
    XLD Microsoft Excel Dialogue Format
    XLDB AQUA Data
    XLF XLIFF Document Format
    XLG AutoCAD External Reference Log
    XLGC ExpressK Database Format
    XLI SIEMENS PLM Software NX 7.5 Log
    XLIFF XLIFF Localization Format
    XLK Microsoft Excel Backup Format
    XLL Microsoft Excel Add-in Format
    XLL_ Microsoft Excel 4 For Mac Add-in
    XLM Microsoft Excel Macro Format
    XLM3 Microsoft Excel 3 For Mac Macro
    XLM4 Microsoft Excel 4 For Mac Macro
    XLMV Thunder Mall Video Format
    XLMX Microsoft Excel Macro-enabled Spreadsheet
    XLM_ Microsoft Excel 2 For Mac Macro
    XLNK XML Link Format
    XLO Autodesk Inventor Export Journal
    XLPF Microsoft Excel For Mac Setting
    XLR Microsoft Works Spreadsheet Or Chart Format
    XLS Microsoft Excel 97 To 2003 Workbook Format
    XLS3 Microsoft Excel 3 For Mac Spreadsheet
    XLS4 Microsoft Excel 4 For Mac Spreadsheet
    XLS5 Microsoft Excel 5 For Mac Spreadsheet
    XLS8 Microsoft Excel 98 For Mac Spreadsheet
    XLSB Microsoft Excel 2007/2010 Binary Workbook Format
    XLSENX Egis Encrypted Excel XLS
    XLSHTML Microsoft Office Excel HTML Document Format
    XLSM Microsoft Excel 2007/2010 Open XML Macro-enabled Workbook Format
    XLSMHTML Microsoft Excel MIME HTML Spreadsheet Format
    XLSX Microsoft Excel 2007, Excel 2010 And Excel 2013 Open XML Workbook Format
    XLSXENX Egis Encrypted Excel XLSX
    XLS_ Microsoft Excel For Mac Spreadsheet
    XLT Microsoft Excel 97 To 2003 Workbook Template Format
    XLTHTML Microsoft Office Excel HTML Template Format
    XLTM Microsoft Excel 2007/2010 Open XML Macro-enabled Workbook Template Format
    XLTX Microsoft Excel 2007/2010 Open XML Workbook Template Format
    XLV Microsoft Excel VBA Module Format
    XLW Microsoft Excel Workspace Format
    XLW3 Microsoft Excel 3 For Mac Workbook
    XLW4 Microsoft Excel 4 For Mac Workbook
    XLW5 Microsoft Excel 5 For Mac Workbook
    XLW_ Microsoft Excel 2 For Mac Workbook
    XLXML Microsoft Excel XML Worksheet
    XLZ Crossword Power Tools Crossword Library
    XM FastTracker 2 Instrument
    XMAP XMind 2007/2008 Workbook
    XMB Lucas Arts X-Wing Mission Briefing Format
    XMC Lingoes Configuration
    XMCD PTC Mathcad Worksheet Format
    XMCDZ PTC Mathcad Compressed Worksheet Format
    XMCT Mathcad Template Format
    XMD GameJack Virtual CD Or DVD Image Format
    XME GME
    XMEF TextMap Evidence Format
    XMF CDRWin Virtual CD Image Format
    XMG The Longest Journey XMG
    XMI Miles Sound System Extended MIDI Files
    XMIND XMind Workbook Format
    XMIT IBM XMIT Data
    XML XML Document Format
    XML-PREV VirtualBox XML Settings Backup
    XMLA XML For Analysis Source
    XMLJET Eclipse JET XML Template
    XMLPER LeCroy Binary Waveform Format
    XMLS Microsoft Excel 2003 XML
    XMLX Excel Spreadsheet
    XMM 3ds Max XML Animation Map Format
    XMMAP MindManager XML Map Format
    XMMAS MindManager XML Theme
    XMMAT MindManager XML Template
    XMO Adobe Authorware Movie Driver
    XMOD Datawatch Monarch Model
    XMP Adobe Extensible Metadata Platform Format
    XMPSES Adobe Premiere Elements
    XMPSKIN XMPlay Skin
    XMPZ Miradi XML Project Format
    XMS Microsoft EXtended Memory Specification
    XMT XMind Workbook Template
    XMTA Microsoft Visual Studio XMTA Document
    XMV Microsoft Xbox Video Format
    XMX AutoCAD External Message Compiled
    XMZ Fasttracker 2 Extended Module Format
    XN Cygnus Ld-scripts
    XNB XNA Game Studio Express XNA Framework Content Pipeline Binary Format
    XND ExNode Download
    XNF Extensible Numerical
    XNK Microsoft Exchange Shortcut Format
    XNODE LabVIEW
    XNP XnView Addon
    XNT QuarkXPress Extension Format
    XNV NVision Layout
    XOB EasyBuilder 8000 Compiled Code
    XOF RenderMorphics Reality Lab 3D Image Format
    XOJO_BINARY_MENU Xojo Binary Menu
    XOJO_BINARY_PROJECT Xojo Binary Project
    XOJO_BINARY_WINDOW Xojo Binary Window
    XOJO_MENU Xojo Menu
    XOJO_PROJECT Xojo Programming Project
    XOJO_WINDOW Xojo Window
    XOJO_XML_MENU Xojo XML Menu
    XOJO_XML_WINDOW Xojo XML Window
    XOL Swiss Map Overlay Format
    XOM Worms 3D Object Format
    XOML Windows Workflow Format
    XOP IGOR Pro Add-on
    XOV RapidForm XOV 3D Inspection/Model
    XP WindowBlinds Temporary Format
    XP0 SecretPhotos Puzzle Graphic Image
    XP2 XPilot NG
    XP3 KiriKiri Package Format
    XP4 KiriKiri Package
    XPAC Sonic & Sega All-Stars Racing For PC Game Audio Archive
    XPADDERCONTROLLER Xpadder Controller Layout Format
    XPADDERPROFILE Xpadder Settings
    XPB XPB! Basic Source Code
    XPD XML Pipeline Document Format
    XPDL XPDL Module
    XPF XProtector Project
    XPG Autoplay Media Studio Exported Page
    XPGT EPUB XML Stylesheet Page Template
    XPI Firefox Browser Extension Format
    XPJ Micro Planner X-Pert Project Format
    XPK PSpice Library Format
    XPKU Apple Mac OS X Universal Binary Package
    XPL X-Plane Plug-in Format
    XPL2 TerraExplorerPro LOD Parameter
    XPM X11 Pixmap Graphic
    XPNG Portable (Public) Network Graphic Bitmap
    XPP X++ Source Code Format
    XPR PTC Pro/ENGINEER Part Format
    XPR3 QuarkXpress 3.0 Mac
    XPRJ Monarch XML Project
    XPS XML Paper Specification Format
    XPS~ WindowBlinds Temporary
    XPT Mozilla Firefox Component
    XPTIN Xpswmm Hydrology Data
    XPW Accessible FormNet Fillable Form
    XPX Intercon FormNet
    XPY MarketBrowser
    XP~ WindowBlinds Temporary
    XQ XQuery Format
    XQL XML Query Language Format
    XQM XQuery Module
    XQT SuperCalc Macro Spreadsheet Format
    XQUERY XQuery Source Code Format
    XQY XQuery Source Format
    XR Cygnus Ld-scripts
    XRC WxWidgets WxPython Resource
    XRD Core Wars Data
    XRDML PANalytical XRD Measurement Data XML
    XREF IBM AIX Cross Reference
    XRF WordSearch Cross Reference Format
    XRFF Extensible Attribute-Relation File Format
    XRL PowerDesigner Report
    XRM-MS Microsoft Security Certificate
    XRNS Extended Renoise Song Format
    XRP RationalPlan Format
    XRS Dig It! Game
    XRX Expression Encoder Media Profile Settings
    XRY XRY Data Format
    XS Age Of Empires 3 Map AI Generator Format
    XS4 XESS Worksheet
    XS5 XESS Worksheet
    XSB XACT Sound Bank
    XSC Microsoft Visual Studio XSC Format
    XSD XML Schema Description Format
    XSF Microsoft Office InfoPath Format
    XSI SOFTIMAGE|XSI 3D Model
    XSIADDON SOFTIMAGE XSI Add-on Format
    XSL XML Stylesheet Format
    XSLIC XenServer License Format
    XSLT XSL Transform Format
    XSM SimCity Societies Game
    XSN Microsoft Office InfoPath Template Form Format
    XSO Expresso Project
    XSP XBMC Smart Playlist Format
    XSPF XML Shareable Playlist Format
    XSQL Oracle XSQL Servlet Server Side
    XSR FabTrol MRP
    XSS XML Stylesheet Format
    XSSLOG Microsoft SharePoint WorkSpace Groove Log
    XSSR Microsoft SharePoint WorkSpace Groove
    XST Microsoft Outlook Personal Folders Format
    XSTB TextBridge
    XSTK XStarter Task
    XSU Fortran 77 Library
    XSVF Xilinx Serial Vector Format
    XSX Microsoft Visual Studio XML Schema Layout Format
    XT FastTracker Music Track Format
    XTC XTrkCAD Project
    XTD XML Type Definition
    XTERME Winstep Extreme Theme
    XTF EXtended Triton Format
    XTG QuarkXpress Tags Format
    XTIC ActivInspire Ticker
    XTL Vietcong Game Data Format
    XTM CmapTools Exported Topic Map Format
    XTML XML4web Virtual HTML Document
    XTMP Avid Xpress Pro Template
    XTND Adobe Acrobat For Mac Plug-In
    XTODVD ConvertXtoDVD Project
    XTP XTreeGold Overlay
    XTRA Adobe Director Xtra
    XTREME Winstep Xtreme Theme Pack Format
    XTRL XTND Translator
    XTXT Xtext
    XUI Xbox 360 Skin Format
    XUL Firefox XML User Interface Language Format
    XUR Xbox 360 Compiled Skin Format
    XV Khoros Visualization Bitmap Image
    XV0 Lattice XVL Structure Format
    XV2 V-XVL Geometry
    XV3 P-XVL Geometry Format
    XVA Citrix Xen Virtual Appliance Format
    XVCT VISE XML Project Format
    XVG Grace Document
    XVID XviD Codec
    XVL EXtensible Virtual World Description Language Document
    XVM VMware Console Configuration Format
    XVMCONF World Of Tanks Configuration Format
    XVO RatDVD Internal
    XVU BOClean Database Format
    XWB XACT Wave Bank Format
    XWC Starbreeze Sound
    XWD X Window Window Screen Dump Or Bitmap
    XWF OmniPage Workflow Format
    XWI Star Wars: X-Wing Mission
    XWK Crosstalk Keyboard Mapping Format
    XWM The Elder Scrolls V: Skyrim Music
    XWMA XWMA Audio Compression Format
    XWMV Microsoft Windows Media
    XWP Xerox Writer Document
    XWS Xara Webstyle Format
    XX XXEncoded Format
    XXD Brixx Planner Calendar Format
    XXE XXEncoded Format
    XXX Compucon/Singer PSW Embroidery Design Format
    XY XyWrite Document
    XY3 XYWrite III Document
    XYP XY Write III Plus Document
    XYS XYplorer Script Format
    XYW XYWrite For Windows 3x/4.0 Document
    XYZ Molecule Specification Format
    XYZE Radiance Map
    XYZI 3rdTech Scanner
    XYZRGB 3rdTech XYZ RGB Graphic
    XYZV Celestia Sampled Trajectory Format
    XZ XZ Utils Compressed Archive
    XZFX ZipLogix ZipForm Format
    XZM Slackware Linux Package
    X_B Parasolid Document Format
    X_T Parasolid File Format