List in alphabetic order - X
- X DirectX Model Format
- 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 Xara3D Project
- X3DB X3D Binary Format
- X3DV Web3D X3D Graphics Image
- X3F SIGMA X3F Camera RAW 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 Disk Image
- X70 XTree Gold For Dos Help
- X80 Xtree Gold Dos Help
- X90 XTree Gold For Dos Help
- XA The Sims Audio 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 3ds Max XML Animation Format
- XAIML XAIML Chatterbot Database Format
- XAML Windows Markup Format
- XAMLX XAMLX Document Format
- XAN Worms Map Format
- XAP Silverlight Application Package
- XAPPL Spoon XML Application Configuration Format
- XAR Xara Xtreme Drawing
- XARC The Longest Journey Audio
- XAS Pro/ENGINEER Assembly Instance Accelerator 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 XenServer Backup Format
- XBL Extensible Binding Language Format
- XBLR Output Raw XBRL
- XBM X11 Bitmap Graphic
- 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 Xbox Saved Game
- XBT SMART Notebook Template Format
- XBX Xbox Icon Or Picture
- XC0 Xtree Gold Dos Help
- XC3 Cast3D 3D Scene
- XCAPPDATA Xcode App 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 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 Project
- XCODEPLUGIN Apple Xcode Extension
- XCODEPROJ Xcode Project
- 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 Format
- XCSNAPSHOTS Xcode Snapshot
- XCT XVI32 Conversion
- XCTL LabVIEW XControls
- XCU OpenOffice.org Configuration Format
- XCUSERSTATE Xcode
- XCWORKSPACE Xcode Workspace Format
- XD0 XtreeGold Dos Help
- XDA Sencha Architect Project
- XDB Symantec Virus Database Format
- XDC Total Commander With DarkCrypt IV Plug-in Encrypted
- XDF Externally Defined Function
- XDFL XDFL Configuration
- XDI WinArchiver Extended Disc Image Format
- XDL XML Schema Format
- XDO Oracle BI Publisher Resource Tracking
- XDOC QuarkXPress 3.0 Document
- XDOCLET JBoss XDoclet Reference
- XDP XML Data Package
- XDR XML-Data Reduced Format
- XDS LCDStudio Design Format
- XDT Win-Test Extra Data
- XDU Backdoor.Win32.PcClient.xdu
- XDV XeTeX
- XDW Fuji Xerox DocuWorks Format
- XE0 XtreeGold Dos Help
- XEF WinAce Encrypted Format
- XEJ Expression Encoder Job Format
- XEL Expression Encoder Live Encoding Format
- XEM PowerDesigner Model Definition Format
- XEN Guitar Hero III Data Format
- XENSEARCH XenCenter Saved Search Format
- XEO Signwave Auto-Illustrator Extension
- XEP EManager Format Packaging Information
- XEQ Sage MAS 90 Data
- XER Primavera P6 Project Format
- XES EManager Skins Definition
- XESC Expression Encoder Screen Capture Format
- XET EManager Process Definition
- XEV EManager Auto-Update Format
- XEVGENXML Adobe Dreamweaver
- XEX Xbox 360 Executable Format
- XEZ EManager Template Package
- XFA OneCncXR CAD
- XFBIN Naruto Shippuden: Ultimate Ninja Storm 2
- XFC X-Fonter Font Collection
- XFD XFD Format
- XFDF Adobe Acrobat XFDF Format
- XFDL XFDL Format
- XFF XFRX Database Output
- XFI XICE Desktop Encrypted
- XFL Flash Movie Archive
- XFM OmniForm XML
- XFN 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 5.0 Format
- 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 Game Patcher Format
- XGS XACT Global Settings Format
- XHB HomeBank Data
- XHP OpenOffice.org Extension Help Format
- XHT XHTML Format
- XHTM Extensible Hypertext Markup Language Document
- XHTML Extensible Hypertext Markup Language Format
- XI Fasttracker 2 Extended Instrument Format
- XIB 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 Excel Spreadsheet
- XLA Excel Add-In Format
- XLA5 Microsoft Excel 5 For Mac Add-in
- XLA8 Microsoft Excel 98 For Mac Add-in
- XLAM Excel Open XML Macro-Enabled Add-In
- XLAMENX Egis Encrypted Excel XLAM
- XLA_ Microsoft Excel 4 For Mac Add-in
- XLB 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 Excel Chart
- XLC3 Microsoft Excel 3 For Mac Chart
- XLC4 Microsoft Excel 4 For Mac Chart
- XLC_ Microsoft Excel 2 For Mac Chart
- XLD Excel Database Format
- XLDB AQUA Data
- XLF XLIFF Document
- XLG AutoCAD External Reference Log
- XLGC ExpressK Database Format
- XLI SIEMENS PLM Software NX 7.5 Log
- XLIFF XLIFF Localization Format
- XLK Excel Backup Format
- XLL Excel Add-In Format
- XLL_ Microsoft Excel 4 For Mac Add-in
- XLM Excel Macro
- 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 Shortcut Format
- XLO Autodesk Inventor Export Journal
- XLPF Microsoft Excel For Mac Setting
- XLR Works Spreadsheet
- XLS Excel Spreadsheet
- 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 Excel Binary Spreadsheet
- XLSENX Egis Encrypted Excel XLS
- XLSHTML Microsoft Excel HTML Spreadsheet
- XLSM Excel Open XML Macro-Enabled Spreadsheet
- XLSMHTML Microsoft Excel MIME HTML Spreadsheet
- XLSX Microsoft Excel Open XML Spreadsheet
- XLSXENX Egis Encrypted Excel XLSX
- XLS_ Microsoft Excel For Mac Spreadsheet
- XLT Excel Template
- XLTHTML Microsoft Excel HTML Spreadsheet Template
- XLTM Excel Open XML Macro-Enabled Spreadsheet Template
- XLTX Excel Open XML Spreadsheet Template
- XLV Excel Visual Basic Module
- XLW 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 Extended Module
- XMAP XMind 2007/2008 Workbook
- XMB Age Of Empires Game Data Format
- XMC Lingoes Configuration
- XMCD Mathcad Worksheet Format
- XMCDZ Mathcad Compressed Worksheet Format
- XMCT Mathcad XML Worksheet Template
- XMD Extended Media Disc Image
- XME GME
- XMEF TextMap Evidence Format
- XMF Cal3D XML Mesh Format
- XMG The Longest Journey XMG
- XMI XML Metadata Interchange Format
- XMIND XMind Workbook Format
- XMIT IBM XMIT Data
- XML XML 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 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 Xbox Media Video Format
- XMX AutoCAD External Message Compiled
- XMZ FastTracker 2 Extended Module
- XN Cygnus Ld-scripts
- XNB XNA Game Studio Binary Package
- XND ExNode Download
- XNF Extensible Numerical
- XNK Exchange Shortcut
- XNODE LabVIEW
- XNP XnView Addon
- XNT QuarkXPress Extension Format
- XNV NVision Layout
- XOB EasyBuilder 8000 Compiled Code
- XOF 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
- 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 Profile
- XPADDERPROFILE Xpadder Settings
- XPB XPB! Basic Source Code
- XPD XML Pipeline Document
- XPDL XPDL Module
- XPF XProtector Project
- XPG Autoplay Media Studio Exported Page
- XPGT EPUB XML Stylesheet Page Template
- XPI Mozilla Installer Package
- XPJ RoboHelp HTML 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 Pro/ENGINEER Part Instance Accelerator 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 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 Format
- XRL PowerDesigner Report
- XRM-MS Microsoft Security Certificate
- XRNS Renoise Song Format
- XRP RationalPlan Project Format
- XRS Dig It! Game
- XRX Expression Encoder Media Profile Settings
- XRY XRY Data Format
- XS Age Of Empires 3 Map AI Generator
- XS4 XESS Worksheet
- XS5 XESS Worksheet
- XSB XACT Sound Bank
- XSC Visual Studio Dataset Internal Info Format
- XSD XML Schema Definition
- XSF InfoPath Form Definition Format
- XSI Softimage XSI 3D Image
- XSIADDON Softimage Add-on Format
- XSL Microsoft SharePoint WorkSpace Groove Database Format
- XSLIC XenServer License Format
- XSLT XSL Transformation Format
- XSM SimCity Societies Game
- XSN InfoPath Form Template Format
- XSO Expresso Project
- XSP XBMC Smart Playlist Format
- XSPF XSPF Playlist Format
- XSQL Oracle XSQL Servlet Server Side
- XSR FabTrol MRP
- XSS XML Style Sheet
- 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 Visual Studio XML Schema Layout Format
- XT Xdebug Trace 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 Data Format
- XTM CmapTools Exported Topic Map
- XTML XML4web Virtual HTML Document
- XTMP Avid Xpress Pro Template
- XTND Adobe Acrobat For Mac Plug-In
- XTODVD ConvertXtoDVD Project
- XTP AutoCAD Exported Tool Palettes Format
- XTRA Adobe Director Xtra
- XTREME Winstep Xtreme Theme Pack
- XTRL XTND Translator
- XTXT Xtext
- XUI Xbox 360 User Interface Format
- XUL XML User Interface Language Format
- XUR Xbox 360 Binary User Interface Format
- XV Khoros Visualization Bitmap Image
- XV0 Lattice XVL Structure Format
- XV2 V-XVL Geometry
- XV3 Lattice XVL Geometry Format
- XVA XenServer Virtual Appliance Format
- XVCT VISE XML Project Format
- XVG Grace Document
- XVID Xvid-Encoded Video Format
- XVL EXtensible Virtual World Description Language Document
- XVM VMware Console Configuration Format
- XVMCONF World Of Tanks XVM Configuration Format
- XVO RatDVD Internal
- XVU BOClean Database Format
- XWB XACT Wave Bank
- XWC Starbreeze Sound
- XWD X Windows Dump Image
- XWF OmniPage Workflow Format
- XWI Star Wars: X-Wing Mission
- XWK Crosstalk Communicator Keyboard Mapping Format
- XWM The Elder Scrolls V: Skyrim Music
- XWMA XWMA Audio Compression Format
- XWMV Microsoft Windows Media
- XWP XMLwriter Project
- XWS Xara Web Designer Graphic
- XX XXEncoded Format
- XXD Brixx Planner Calendar
- XXE XXEncoded Format
- XXX Compucon Singer Embroidery Format
- XY XYWrite Document
- XY3 XYWrite III Document
- XYP XYWrite Plus Document
- XYS XYplorer Script Format
- XYW XYWrite For Windows Document
- XYZ Molecule Specification Format
- XYZE Radiance Map
- XYZI 3rdTech Scanner
- XYZRGB 3rdTech XYZ RGB Graphic
- XYZV Celestia Sampled Trajectory Format
- XZ XZ Compressed Archive
- XZFX ZipLogix ZipForm Format
- XZM Slackware Linux Package
- X_B Parasolid Model Part Format
- X_T Parasolid Model Part Format