| Estensione del file | Autore/Produttore | Descrizione del file |
|---|---|---|
| Estensione X | N/A | Lex Language Source Code |
| Estensione X-PNG | Boris Eyrich | Portable (Public) Network Graphic Bitmap |
| Estensione X01 | Corel Corporation | Corel Paradox Secondary Index |
| Estensione X02 | Corel Corporation | Corel Paradox Secondary Index |
| Estensione X03 | Corel Corporation | Corel Paradox Secondary Index |
| Estensione X04 | Corel Corporation | Corel Paradox Secondary Index |
| Estensione X05 | Corel Corporation | Corel Paradox Secondary Index |
| Estensione X06 | Corel Corporation | Corel Paradox Secondary Index |
| Estensione X07 | Corel Corporation | Corel Paradox Secondary Index |
| Estensione X08 | Corel Corporation | Corel Paradox Secondary Index |
| Estensione X09 | Corel Corporation | Corel Paradox Secondary Index |
| Estensione X1 | X1 Technologies, Inc. | X1 Desktop Search Saved Search |
| Estensione X10 | X.Org Foundation | X Window Bitmap Dump |
| Estensione X11 | X.Org Foundation | X Window System Bitmap Image |
| Estensione X13 | Darxabre | Hooligans Game Archive |
| Estensione X20 | Jeffrey C Johnson (XTree Company) | XTree Gold For Dos Help |
| Estensione X32 | Adobe Systems | Adobe Xtra Format |
| Estensione X3A | N/A | MOTIF XF |
| Estensione X3D | MAGIX | X3D Format |
| Estensione X3DB | Web3D Consortium | X3D Binary Format |
| Estensione X3DV | Web3D Consortium | Web3D X3D Graphics Image |
| Estensione X3F | SIGMA | Sigma Camera RAW Picture Format |
| Estensione X3G | MakerBot Industries, LLC | MakerBot MakerWare Document |
| Estensione X40 | Jeffrey C Johnson (XTree Company) | XtreeGold Dos Help |
| Estensione X4K | Optimal Performance | XML4King Configuration Format |
| Estensione X50 | Jeffrey C Johnson (XTree Company) | XTreeGold Dos Help |
| Estensione X60 | Jeffrey C Johnson (XTree Company) | Xtree Gold For Dos Help |
| Estensione X64 | N/A | Commodore 64 Emulator Disk Image |
| Estensione X70 | Jeffrey C Johnson (XTree Company) | XTree Gold For Dos Help |
| Estensione X80 | Jeffrey C Johnson (XTree Company) | Xtree Gold DOS Help |
| Estensione X90 | Jeffrey C Johnson (XTree Company) | XTree Gold For Dos Help |
| Estensione XA | Electronic Arts | The Sims Extensive Audio Format |
| Estensione XA0 | Jeffrey C Johnson (XTree Company) | Xtree Gold Dos Help |
| Estensione XAB | Microsoft Corporation | Microsoft Outlook Express Address Book |
| Estensione XAC | Electronic Arts, Inc. | SimCity Societies Game |
| Estensione XAD | N/A | EXotic ADlib Sound Format |
| Estensione XADD | Microsoft | Expression Web Add-in |
| Estensione XADML | Cloanto Italia srl | Amiga Forever XADML |
| Estensione XAF | Autodesk | Xml Compatible Animation Format |
| Estensione XAIML | Devyn Collier Johnson | XAIML Database Format |
| Estensione XAML | Microsoft | XAML Format |
| Estensione XAMLX | Microsoft | Visual Studio Workflow Service Format |
| Estensione XAN | Team17 Software | Worms 3D Map Format |
| Estensione XAP | Microsoft | Microsoft Silverlight Application Package Format |
| Estensione XAPPL | Spoon | Virtual Application Studio XML Application Configuration Format |
| Estensione XAR | MAGIX | Xara Vector Drawing Format |
| Estensione XARC | Funcom | The Longest Journey Audio |
| Estensione XAS | Parametric Technology | PTC Pro/Engineer Assembly Format |
| Estensione XAV | Final Draft, Inc. | Final Draft AV Document |
| Estensione XAVC | N/A | Sony XAVC Video Format |
| Estensione XB0 | Jeffrey C Johnson (XTree Company) | Xtree Gold DOS Help |
| Estensione XBA | Oracle | OpenOffice.org Basic Module Format |
| Estensione XBAP | Microsoft | XAML Browser Application Format |
| Estensione XBB | DVIPDFMx Project Team | DVIPDFMx Output |
| Estensione XBC | SMART Technologies | SMART Notebook Format |
| Estensione XBD | Fuji Xerox Co., Ltd. | Fuji Xerox Docuworks |
| Estensione XBDOC | Xiosis | Xiosis Scribe Document |
| Estensione XBE | Microsoft | Xbox Executable Format |
| Estensione XBEL | Python XML SIG | XBEL Bookmarks Format |
| Estensione XBF | Electronic Arts, Inc. | Emperor Battle For Dune |
| Estensione XBK | SMART Technologies | SMART Notebook Format |
| Estensione XBL | Mozilla | Extensible Binding Language Format |
| Estensione XBLR | N/A | Output Raw XBRL |
| Estensione XBM | N/A | X Windows System Bitmap Image |
| Estensione XBMML | N/A | Braille Music Score |
| Estensione XBMP | Midway Home Entertainment Inc. | Area 51 Game |
| Estensione XBN | HyperG/Smuggl0r | Xnick Nick Backup |
| Estensione XBPLATE | Xiosis | Xiosis Scribe Template |
| Estensione XBRL | N/A | Extensible Business Reporting Language |
| Estensione XBSAV | Electronic Arts | Mass Effect 2 For Xbox Saved Game Format |
| Estensione XBT | SMART Technologies | SMART Notebook Template Format |
| Estensione XBX | Microsoft Corporation | Xbox Icon Or Picture |
| Estensione XC0 | Jeffrey C Johnson (XTree Company) | Xtree Gold Dos Help |
| Estensione XC3 | Cast3D project team | Cast3D 3D Scene |
| Estensione XCAPPDATA | Apple | Apple Xcode Application Data Format |
| Estensione XCARCHIVE | Apple | Xcode Archive |
| Estensione XCCONFIG | Apple, Inc. | Apple Xcode Configuration Settings |
| Estensione XCDATAMODEL | Apple | Xcode Core Data Model Format |
| Estensione XCDATAMODELD | Apple | Xcode Core Data Model Format |
| Estensione XCEL | Microsoft Corporation | Microsoft Excel For Mac Spreadsheet |
| Estensione XCF | GIMP | GIMP XCF Bitmap Image Format |
| Estensione XCH | Link-Assistant.com | LinkAssistant Project Settings |
| Estensione XCI | Adobe Systems Incorporated | Adobe Reader Font Mapping |
| Estensione XCL | Jeffrey C Johnson (XTree Company) | XTree For Windows Script |
| Estensione XCM | IHMC | CmapTools Exported Concept Map |
| Estensione XCO | Xilinx, Inc. | Xilinx CORE Generator Log |
| Estensione XCODE | N/A | Xcode Development Project Format |
| Estensione XCODEPLUGIN | Apple, Inc. | Apple Xcode Extension |
| Estensione XCODEPROJ | N/A | XCode Project Format |
| Estensione XCOF | Apple, Inc. | Mac OS Object Library |
| Estensione XCON | Ankit Malhotra | Conceal Encrypted Data |
| Estensione XCORPUS | University of Oxford | Xaira Corpora |
| Estensione XCP | Advanced Systems Concepts, Inc. | XLNT Script Command |
| Estensione XCPLUGIN | Apple, Inc. | Apple Xcode Extension |
| Estensione XCPLUGINDATA | Apple, Inc. | Xcode Plug-in Data |
| Estensione XCR | Enlight Software. Ltd. | Warlords Battlecry Game |
| Estensione XCSCHEME | Apple, Inc. | Apple Xcode Scheme |
| Estensione XCSL | Technicolor | CineStyle Color Correction Settings Format |
| Estensione XCSNAPSHOTS | Apple | Xcode Snapshot |
| Estensione XCT | N/A | XVI32 Conversion |
| Estensione XCTL | National Instruments Corporation | LabVIEW XControls |
| Estensione XCU | OpenOffice.org | OpenOffice.org Extension Control Format |
| Estensione XCUSERSTATE | Apple, Inc. | Xcode |
| Estensione XCWORKSPACE | Apple | Xcode Workspace Format |
| Estensione XD0 | Jeffrey C Johnson (XTree Company) | XtreeGold Dos Help |
| Estensione XDA | Sencha Inc. | Sencha Architect Project |
| Estensione XDB | Symantec | Norton Antivirus Update Format |
| Estensione XDC | Adobe Systems Incorporated | Adobe Acrobat Printer Description |
| Estensione XDF | IBM | Extended Disk Format Image |
| Estensione XDFL | XDFLengine Team | XDFL Configuration |
| Estensione XDI | WinArchiver Computing | WinArchiver Compressed ISO Image Format |
| Estensione XDL | N/A | MS SQL Server XML Schema Format |
| Estensione XDO | Oracle Corporation | Oracle BI Publisher Resource Tracking |
| Estensione XDOC | N/A | QuarkXPress 3.0 Document |
| Estensione XDOCLET | Red Hat, Inc. | JBoss XDoclet Reference |
| Estensione XDP | N/A | Acrobat XML Data Package Format |
| Estensione XDR | Microsoft | XML Data Reduced Format |
| Estensione XDS | Invisionsoft | Nintendo DS Game Maker Project Format |
| Estensione XDT | Olivier F5MZN | Win-Test Extra Data |
| Estensione XDU | N/A | Backdoor.Win32.PcClient.xdu |
| Estensione XDV | N/A | XeTeX |
| Estensione XDW | Fuji Xerox | DocuWorks Document Format |
| Estensione XE0 | Jeffrey C Johnson (XTree Company) | XtreeGold Dos Help |
| Estensione XEF | N/A | X-Genics EManager Form Data Format |
| Estensione XEJ | Microsoft | Microsoft Expression Encoder Job Format |
| Estensione XEL | Microsoft | Microsoft Expression Encoder 3.0 Live Jobs Format |
| Estensione XEM | N/A | X-Genics EManager Metered Units |
| Estensione XEN | Activision | Activision Guitar Hero 3 Data Format |
| Estensione XENSEARCH | Citrix | XenCenter Saved Search Format |
| Estensione XEO | Signwave UK | Signwave Auto-Illustrator Extension |
| Estensione XEP | N/A | EManager File Packing Definition |
| Estensione XEQ | The Sage Group plc | Sage MAS 90 Data |
| Estensione XER | Oracle | Primavera Project Management Propriety Exchange Format |
| Estensione XES | N/A | X-Genics EManager Skins Definition |
| Estensione XESC | Microsoft | Microsoft Expression Encoder Screen Capture Format |
| Estensione XET | N/A | X-Genics EManager Process Definition |
| Estensione XEV | N/A | X-Genics EManager Auto-update Format |
| Estensione XEVGENXML | Adobe Systems Incorporated | Adobe Dreamweaver |
| Estensione XEX | Microsoft | Xbox 360 Executable Format |
| Estensione XEZ | N/A | X-Genics EManager Template Package |
| Estensione XFA | OneCNC LLC | OneCncXR CAD |
| Estensione XFBIN | CyberConnect2 | Naruto Shippuden: Ultimate Ninja Storm 2 |
| Estensione XFC | Blacksun Software | X-Fonter Font Collection |
| Estensione XFD | UWI | Adobe XFDL Format XML Form Format |
| Estensione XFDF | Adobe Systems | Adobe Acrobat Forms Document |
| Estensione XFDL | UWI | XFDL Format |
| Estensione XFF | Martin Haluza | XFRX Database Output |
| Estensione XFI | xICE.NET | XICE Desktop Encrypted |
| Estensione XFL | Adobe Systems | Adobe Flash Exchange Format |
| Estensione XFM | Nuance Communications, Inc. | OmniForm XML |
| Estensione XFN | N/A | Corel Ventura Printer Font |
| Estensione XFO | N/A | XSL-FO Formatted Form |
| Estensione XFP | Microsoft Corporation | Microsoft SharePoint Extending Form Library Properties |
| Estensione XFR | TIBCO Software | IProcess Process Definition Format |
| Estensione XFS | eRacer | ERacer Sound Format |
| Estensione XFT | N/A | Adobe Form Designer Form |
| Estensione XFZ | Declan Software | French FlashCards Vocabulary |
| Estensione XG0 | Corel Corporation | Corel Paradox Secondary Index |
| Estensione XG1 | Corel Corporation | Corel Paradox Secondary Index |
| Estensione XG2 | Corel Corporation | Corel Paradox Secondary Index |
| Estensione XG3 | Corel Corporation | Corel Paradox Secondary Index |
| Estensione XG4 | Corel Corporation | Corel Paradox Secondary Index |
| Estensione XG5 | Corel Corporation | Corel Paradox Secondary Index |
| Estensione XGA | Imagine Sports | Diamond Mind Baseball Game Account Information |
| Estensione XGD | Microsoft Corporation | Xbox 360 Game Disc Layout |
| Estensione XGL | N/A | XGL 3D CAD Model |
| Estensione XGLL | AFMG Technologies GmbH | EASE SpeakerLab Text |
| Estensione XGML | N/A | Graph Modeling Language XML Format |
| Estensione XGMML | N/A | XGMML Graph Format |
| Estensione XGO | GeoConcept SA | GeoConcept Add-on |
| Estensione XGP | XGP | Xfire Profile Patcher Game List Format |
| Estensione XGS | Microsoft | XACT Global Settings Format |
| Estensione XHB | N/A | HomeBank Data |
| Estensione XHP | OpenOffice.org Project Team | OpenOffice.org Extension Help Format |
| Estensione XHTM | N/A | Extensible HTML Format |
| Estensione XHTML | N/A | Extensible HTML Format |
| Estensione XI | N/A | Fastracker 2.0 Instrument Format |
| Estensione XIB | Apple | Apple Interface Builder Format |
| Estensione XIF | Nuance Communications | ScanSoft Pagis Format |
| Estensione XIG | N/A | XML Instance Generator |
| Estensione XIL | SourceForge.net | Xilize |
| Estensione XILINC | SourceForge.net | Xilize Defintion |
| Estensione XILIZE | SourceForge.net | Xilize Configuration |
| Estensione XIM | N/A | X11 Xim Toolkit Bitmap |
| Estensione XIN | Stilo International plc | OmniMark Include |
| Estensione XIP | N/A | Xbox Dashboard |
| Estensione XISE | Xilinx | Xilinx ISE Project Format |
| Estensione XISO | xiso | Xbox ISO |
| Estensione XIT | New River Kinematics | SpatialAnalyzer |
| Estensione XIT64 | New River Kinematics | SpatialAnalyzer |
| Estensione XIX | N/A | IIS NNTP Subject Lists |
| Estensione XIZ | SourceForge.net | Ximinez |
| Estensione XJB | Oracle Corporation | OEPE JAXB Wizard Bindings |
| Estensione XJT | The GIMP Team | Compressed GIMP Image |
| Estensione XKM | Various Linux developers | X KeyBoard |
| Estensione XL | Microsoft | Microsoft Excel Spreadsheet Format |
| Estensione XLA | Microsoft | Microsoft Excel Add-in Format |
| Estensione XLA5 | Microsoft Corporation | Microsoft Excel 5 For Mac Add-in |
| Estensione XLA8 | Microsoft Corporation | Microsoft Excel 98 For Mac Add-in |
| Estensione XLAM | Microsoft | Microsoft Excel 2007/2010 Open XML Macro-enabled Add-in Format |
| Estensione XLAMENX | Egis Technology Inc. | Egis Encrypted Excel XLAM |
| Estensione XLA_ | Microsoft Corporation | Microsoft Excel 4 For Mac Add-in |
| Estensione XLB | Microsoft | Microsoft Excel Toolbars Format |
| Estensione XLB4 | Microsoft Corporation | Microsoft Excel 4 For Mac Toolbars |
| Estensione XLB5 | Microsoft Corporation | Microsoft Excel 5 For Mac Toolbars |
| Estensione XLB8 | Microsoft Corporation | Microsoft Excel 98 For Mac Toolbars |
| Estensione XLBN | Microsoft Corporation | Microsoft Excel 1 For Mac Toolbars |
| Estensione XLC | Microsoft | Microsoft Excel Chart Format |
| Estensione XLC3 | Microsoft Corporation | Microsoft Excel 3 For Mac Chart |
| Estensione XLC4 | Microsoft Corporation | Microsoft Excel 4 For Mac Chart |
| Estensione XLC_ | Microsoft Corporation | Microsoft Excel 2 For Mac Chart |
| Estensione XLD | Microsoft | Microsoft Excel Dialogue Format |
| Estensione XLDB | PRIORITY DISPATCH CORP. | AQUA Data |
| Estensione XLG | Autodesk, Inc. | AutoCAD External Reference Log |
| Estensione XLGC | Prosystech | ExpressK Database Format |
| Estensione XLI | Siemens Product Lifecycle Management Software Inc. | SIEMENS PLM Software NX 7.5 Log |
| Estensione XLIFF | OASIS | XLIFF Localization Format |
| Estensione XLK | Microsoft | Microsoft Excel Backup Format |
| Estensione XLL | Microsoft | Microsoft Excel Add-in Format |
| Estensione XLL_ | Microsoft Corporation | Microsoft Excel 4 For Mac Add-in |
| Estensione XLM | Microsoft | Microsoft Excel Macro Format |
| Estensione XLM3 | Microsoft Corporation | Microsoft Excel 3 For Mac Macro |
| Estensione XLM4 | Microsoft Corporation | Microsoft Excel 4 For Mac Macro |
| Estensione XLMV | Thunder Network Technologies | Thunder Mall Video Format |
| Estensione XLMX | Microsoft Corporation | Microsoft Excel Macro-enabled Spreadsheet |
| Estensione XLM_ | Microsoft Corporation | Microsoft Excel 2 For Mac Macro |
| Estensione XLNK | N/A | XML Link Format |
| Estensione XLO | Autodesk, Inc. | Autodesk Inventor Export Journal |
| Estensione XLPF | Microsoft Corporation | Microsoft Excel For Mac Setting |
| Estensione XLR | Microsoft | Microsoft Works Spreadsheet Or Chart Format |
| Estensione XLS | Microsoft | Microsoft Excel 97 To 2003 Workbook Format |
| Estensione XLS3 | Microsoft Corporation | Microsoft Excel 3 For Mac Spreadsheet |
| Estensione XLS4 | Microsoft Corporation | Microsoft Excel 4 For Mac Spreadsheet |
| Estensione XLS5 | Microsoft Corporation | Microsoft Excel 5 For Mac Spreadsheet |
| Estensione XLS8 | Microsoft Corporation | Microsoft Excel 98 For Mac Spreadsheet |
| Estensione XLSB | Microsoft | Microsoft Excel 2007/2010 Binary Workbook Format |
| Estensione XLSENX | Egis Technology Inc. | Egis Encrypted Excel XLS |
| Estensione XLSHTML | Microsoft | Microsoft Office Excel HTML Document Format |
| Estensione XLSM | Microsoft | Microsoft Excel 2007/2010 Open XML Macro-enabled Workbook Format |
| Estensione XLSMHTML | Microsoft | Microsoft Excel MIME HTML Spreadsheet Format |
| Estensione XLSX | Microsoft | Microsoft Excel 2007, Excel 2010 And Excel 2013 Open XML Workbook Format |
| Estensione XLSXENX | Egis Technology Inc. | Egis Encrypted Excel XLSX |
| Estensione XLS_ | Microsoft Corporation | Microsoft Excel For Mac Spreadsheet |
| Estensione XLT | Microsoft | Microsoft Excel 97 To 2003 Workbook Template Format |
| Estensione XLTHTML | Microsoft | Microsoft Office Excel HTML Template Format |
| Estensione XLTM | Microsoft | Microsoft Excel 2007/2010 Open XML Macro-enabled Workbook Template Format |
| Estensione XLTX | Microsoft | Microsoft Excel 2007/2010 Open XML Workbook Template Format |
| Estensione XLV | Microsoft | Microsoft Excel VBA Module Format |
| Estensione XLW | Microsoft | Microsoft Excel Workspace Format |
| Estensione XLW3 | Microsoft Corporation | Microsoft Excel 3 For Mac Workbook |
| Estensione XLW4 | Microsoft Corporation | Microsoft Excel 4 For Mac Workbook |
| Estensione XLW5 | Microsoft Corporation | Microsoft Excel 5 For Mac Workbook |
| Estensione XLW_ | Microsoft Corporation | Microsoft Excel 2 For Mac Workbook |
| Estensione XLXML | Microsoft Corporation | Microsoft Excel XML Worksheet |
| Estensione XLZ | CPT | Crossword Power Tools Crossword Library |
| Estensione XM | Fasttracker | FastTracker 2 Instrument |
| Estensione XMAP | XMind | XMind 2007/2008 Workbook |
| Estensione XMB | Microsoft | Microsoft Age Of Empires Game Data Format |
| Estensione XMC | Lingoes Project | Lingoes Configuration |
| Estensione XMCD | Parametric Technology Corporatio | PTC Mathcad Worksheet Format |
| Estensione XMCDZ | Parametric Technology Corporation | PTC Mathcad Compressed Worksheet Format |
| Estensione XMCT | PTC | Mathcad Template Format |
| Estensione XMD | Disc4You | GameJack Virtual CD Or DVD Image Format |
| Estensione XME | ISIS / Vanderbilt University / School of Engineering | GME |
| Estensione XMEF | LexisNexis | TextMap Evidence Format |
| Estensione XMF | N/A | EXtensible Music Format |
| Estensione XMG | Funcom | The Longest Journey XMG |
| Estensione XMI | N/A | Miles Sound System Extended MIDI Files |
| Estensione XMIND | XMind | XMind Workbook Format |
| Estensione XMIT | N/A | IBM XMIT Data |
| Estensione XML | N/A | XML Document Format |
| Estensione XML-PREV | Oracle Corporation | VirtualBox XML Settings Backup |
| Estensione XMLA | N/A | XML For Analysis Source |
| Estensione XMLJET | The Eclipse Foundation | Eclipse JET XML Template |
| Estensione XMLPER | N/A | LeCroy Binary Waveform Format |
| Estensione XMLS | Microsoft Corporation | Microsoft Excel 2003 XML |
| Estensione XMLX | Microsoft Corporation | Excel Spreadsheet |
| Estensione XMM | Autodesk | 3ds Max XML Animation Map Format |
| Estensione XMMAP | Mindjet | MindManager XML Map Format |
| Estensione XMMAS | Mindjet | MindManager XML Theme |
| Estensione XMMAT | Mindjet | MindManager XML Template |
| Estensione XMO | Adobe Systems Incorporated | Adobe Authorware Movie Driver |
| Estensione XMOD | Datawatch Corporation | Datawatch Monarch Model |
| Estensione XMP | Adobe Systems | Adobe Extensible Metadata Platform Format |
| Estensione XMPSES | Adobe Systems Incorporated | Adobe Premiere Elements |
| Estensione XMPSKIN | Un4seen Developments | XMPlay Skin |
| Estensione XMPZ | Benetech | Miradi XML Project Format |
| Estensione XMS | Microsoft Corporation | Microsoft EXtended Memory Specification |
| Estensione XMT | XMind Ltd. | XMind Workbook Template |
| Estensione XMTA | Microsoft Corporation | Microsoft Visual Studio XMTA Document |
| Estensione XMV | Microsoft | Microsoft Xbox Video Format |
| Estensione XMX | Autodesk, Inc. | AutoCAD External Message Compiled |
| Estensione XMZ | N/A | Fasttracker 2 Extended Module Format |
| Estensione XN | Red Hat, Inc. | Cygnus Ld-scripts |
| Estensione XNB | Microsoft | XNA Game Studio Express XNA Framework Content Pipeline Binary Format |
| Estensione XND | Logistical Computing and Internetworking (LoCI) Laboratory | ExNode Download |
| Estensione XNF | Satinmage | Extensible Numerical |
| Estensione XNK | N/A | Microsoft Exchange Shortcut Format |
| Estensione XNODE | National Instruments Corporation | LabVIEW |
| Estensione XNP | N/A | XnView Addon |
| Estensione XNT | Quark | QuarkXPress Extension Format |
| Estensione XNV | N/A | NVision Layout |
| Estensione XOB | Nematron | EasyBuilder 8000 Compiled Code |
| Estensione XOF | RenderMorphics | RenderMorphics Reality Lab 3D Image Format |
| Estensione XOJO_BINARY_MENU | Xojo, Inc. | Xojo Binary Menu |
| Estensione XOJO_BINARY_PROJECT | Xojo, Inc. | Xojo Binary Project |
| Estensione XOJO_BINARY_WINDOW | Xojo, Inc. | Xojo Binary Window |
| Estensione XOJO_MENU | Xojo, Inc. | Xojo Menu |
| Estensione XOJO_PROJECT | Xojo, Inc. | Xojo Programming Project |
| Estensione XOJO_WINDOW | Xojo, Inc. | Xojo Window |
| Estensione XOJO_XML_MENU | Xojo, Inc. | Xojo XML Menu |
| Estensione XOJO_XML_WINDOW | N/A | Xojo XML Window |
| Estensione XOL | N/A | Swiss Map Overlay Format |
| Estensione XOM | Team 17 Software | Worms 3D Object Format |
| Estensione XOML | N/A | Windows Workflow Format |
| Estensione XOP | N/A | IGOR Pro Add-on |
| Estensione XOV | Rapidform, Inc. | RapidForm XOV 3D Inspection/Model |
| Estensione XP | N/A | Fasttracker Pattern |
| Estensione XP0 | N/A | SecretPhotos Puzzle Graphic Image |
| Estensione XP2 | XPilot NG | XPilot NG |
| Estensione XP3 | KiriKiri | KiriKiri Package Format |
| Estensione XP4 | KiriKiri | KiriKiri Package |
| Estensione XPAC | Sega Corporation | Sonic & Sega All-Stars Racing For PC Game Audio Archive |
| Estensione XPADDERCONTROLLER | Xpadder | Xpadder Controller Layout Format |
| Estensione XPADDERPROFILE | N/A | Xpadder Settings |
| Estensione XPB | Tony D. Jones | XPB! Basic Source Code |
| Estensione XPD | Sony | PlayStation Store PSP License Format |
| Estensione XPDL | Workflow Management Coalition | XPDL Module |
| Estensione XPF | Oreans Technologies | XProtector Project |
| Estensione XPG | Indigo Rose | Autoplay Media Studio Exported Page |
| Estensione XPGT | Adobe Systems Incorporated | EPUB XML Stylesheet Page Template |
| Estensione XPI | Mozilla | Firefox Browser Extension Format |
| Estensione XPJ | Adobe Systems | RoboHelp HTML Project Format |
| Estensione XPK | THQ | WWE RAW Model Format |
| Estensione XPKU | Apple, Inc. | Apple Mac OS X Universal Binary Package |
| Estensione XPL | LcdStudio | LcdStudio Configuration Playlist |
| Estensione XPL2 | Skyline Software Systems Inc. | TerraExplorerPro LOD Parameter |
| Estensione XPM | N/A | X11 Pixmap Graphic |
| Estensione XPNG | N/A | Portable (Public) Network Graphic Bitmap |
| Estensione XPP | Microsoft | X++ Source Code Format |
| Estensione XPR | Parametric Technology | PTC Pro/ENGINEER Part Format |
| Estensione XPR3 | N/A | QuarkXpress 3.0 Mac |
| Estensione XPRJ | Datawatch Corporation | Monarch XML Project |
| Estensione XPS | Microsoft | XML Paper Specification Format |
| Estensione XPS~ | Stardock Corporation | WindowBlinds Temporary |
| Estensione XPT | N/A | Mozilla Firefox Component |
| Estensione XPTIN | XP Solutions Inc. | Xpswmm Hydrology Data |
| Estensione XPW | Intercon Associates Inc. | Accessible FormNet Fillable Form |
| Estensione XPX | Intercon Associates Inc. | Intercon FormNet |
| Estensione XPY | Leading Market Technologies, Inc. | MarketBrowser |
| Estensione XP~ | Stardock Corporation | WindowBlinds Temporary |
| Estensione XQ | The W3C XML Query Working Group | XQuery Format |
| Estensione XQL | The W3C XML Query Working Group | XML Query Language Format |
| Estensione XQM | The W3C XML Query Working Group | XQuery Module |
| Estensione XQT | N/A | SuperCalc Macro Spreadsheet Format |
| Estensione XQUERY | The W3C XML Query Working Group | XQuery Source Code Format |
| Estensione XQY | The W3C XML Query Working Group | XQuery Source Format |
| Estensione XR | Red Hat, Inc. | Cygnus Ld-scripts |
| Estensione XRC | Adobe Systems Incorporated | WxWidgets WxPython Resource |
| Estensione XRD | N/A | Core Wars Data |
| Estensione XRDML | PANalytical B.V. | PANalytical XRD Measurement Data XML |
| Estensione XREF | IBM | IBM AIX Cross Reference |
| Estensione XRF | Cal3D | Cal3D XML Materials Format |
| Estensione XRFF | University of Waikato | Extensible Attribute-Relation File Format |
| Estensione XRL | Sybase Inc. | PowerDesigner Report |
| Estensione XRM-MS | Microsoft | Microsoft Security Certificate |
| Estensione XRNS | Renoise | Extended Renoise Song Format |
| Estensione XRP | Stand By Soft | RationalPlan Format |
| Estensione XRS | RealNetworks, Inc. | RealPlayer Plugin External Resources |
| Estensione XRX | Microsoft Corporation | Expression Encoder Media Profile Settings |
| Estensione XRY | Micro Systemation | XRY Data Format |
| Estensione XS | Microsoft | Age Of Empires 3 Map AI Generator Format |
| Estensione XS4 | AIS | XESS Worksheet |
| Estensione XS5 | AIS | XESS Worksheet |
| Estensione XSB | Microsoft | XACT Sound Bank |
| Estensione XSC | Microsoft | Microsoft Visual Studio XSC Format |
| Estensione XSD | N/A | XML Schema Description Format |
| Estensione XSF | Microsoft | Microsoft Office InfoPath Format |
| Estensione XSI | Autodesk | SOFTIMAGE|XSI 3D Model |
| Estensione XSIADDON | Autodesk | SOFTIMAGE XSI Add-on Format |
| Estensione XSL | N/A | XML Stylesheet Format |
| Estensione XSLIC | Citrix | XenServer License Format |
| Estensione XSLT | N/A | XSL Transform Format |
| Estensione XSM | Electronic Arts, Inc. | SimCity Societies Game |
| Estensione XSN | Microsoft | Microsoft Office InfoPath Template Form Format |
| Estensione XSO | Ultrapico | Expresso Project |
| Estensione XSP | XBMC | XBMC Smart Playlist Format |
| Estensione XSPF | N/A | XML Shareable Playlist Format |
| Estensione XSQL | Oracle Corporation | Oracle XSQL Servlet Server Side |
| Estensione XSR | FabTrol Systems | FabTrol MRP |
| Estensione XSS | Oracle | XML Style Sheet |
| Estensione XSSLOG | Microsoft Corporation | Microsoft SharePoint WorkSpace Groove Log |
| Estensione XSSR | Microsoft Corporation | Microsoft SharePoint WorkSpace Groove |
| Estensione XST | IBM | IBM WebSphere Query Template Format |
| Estensione XSTB | Nuance Communications, Inc. | TextBridge |
| Estensione XSTK | xStarter Solutions, Inc. | XStarter Task |
| Estensione XSU | IBM | Fortran 77 Library |
| Estensione XSVF | Xilinx | Xilinx Serial Vector Format |
| Estensione XSX | Microsoft | Microsoft Visual Studio XML Schema Layout Format |
| Estensione XT | N/A | FastTracker Music Track Format |
| Estensione XTC | MartinFischer | XTrkCAD Project |
| Estensione XTD | N/A | XML Type Definition |
| Estensione XTERME | WinStep Software Technologies | Winstep Extreme Theme |
| Estensione XTF | N/A | EXtended Triton Format |
| Estensione XTG | Ben StĂÂśver | Extensible TreeGraph Format |
| Estensione XTIC | Promethean World plc | ActivInspire Ticker |
| Estensione XTL | Pterodon | Vietcong Game Data Format |
| Estensione XTM | Onder Arslan | Xtremsplit Split Data Format |
| Estensione XTML | Altairis, s. r. o. | XML4web Virtual HTML Document |
| Estensione XTMP | Avid Technology, Inc. | Avid Xpress Pro Template |
| Estensione XTND | N/A | Adobe Acrobat For Mac Plug-In |
| Estensione XTODVD | VSO-Software | ConvertXtoDVD Project |
| Estensione XTP | Autodesk | AutoCAD Exported Tool Palettes Format |
| Estensione XTRA | Adobe Systems Incorporated | Adobe Director Xtra |
| Estensione XTREME | Winstep Software Technologies | Winstep Xtreme Theme Pack Format |
| Estensione XTRL | N/A | XTND Translator |
| Estensione XTXT | The Eclipse Foundation | Xtext |
| Estensione XUI | Microsoft | Xbox 360 Skin Format |
| Estensione XUL | Mozilla | Firefox XML User Interface Language Format |
| Estensione XUR | Microsoft | Xbox 360 Compiled Skin Format |
| Estensione XV | N/A | Khoros Visualization Bitmap Image |
| Estensione XV0 | Lattice Technology | Lattice XVL Structure Format |
| Estensione XV2 | Lattice Technology, Inc. | V-XVL Geometry |
| Estensione XV3 | Lattice Technology | P-XVL Geometry Format |
| Estensione XVA | Citrix | Citrix Xen Virtual Appliance Format |
| Estensione XVCT | MindVision Software | VISE XML Project Format |
| Estensione XVG | Grace Development Team | Grace Document |
| Estensione XVID | Xvid | XviD Codec |
| Estensione XVL | Lattice Technology, Inc. | EXtensible Virtual World Description Language Document |
| Estensione XVM | VMware | VMware Console Configuration Format |
| Estensione XVMCONF | XVM | World Of Tanks Configuration Format |
| Estensione XVO | RatDVD.CA | RatDVD Internal |
| Estensione XVU | Comodo Group, Inc. | BOClean Database Format |
| Estensione XWB | Microsoft | XACT Wave Bank Format |
| Estensione XWC | Starbreeze | Starbreeze Sound |
| Estensione XWD | N/A | X Window Window Screen Dump Or Bitmap |
| Estensione XWF | Nuance Communications | OmniPage Workflow Format |
| Estensione XWI | LucasArts Entertainment Company, LLC | Star Wars: X-Wing Mission |
| Estensione XWK | Intel | Crosstalk Keyboard Mapping Format |
| Estensione XWM | Bethesda Softworks LLC | The Elder Scrolls V: Skyrim Music |
| Estensione XWMA | Microsoft Corporation | XWMA Audio Compression Format |
| Estensione XWMV | Microsoft Corporation | Microsoft Windows Media |
| Estensione XWP | N/A | XMLwriter Project |
| Estensione XWS | MAGIX | Xara Webstyle Format |
| Estensione XX | N/A | XXEncoded Format |
| Estensione XXD | Brixx | Brixx Planner Calendar Format |
| Estensione XXE | N/A | XXEncoded Format |
| Estensione XXX | Compucon USA | Compucon/Singer PSW Embroidery Design Format |
| Estensione XY | XyQuest | XyWrite Document |
| Estensione XY3 | N/A | XYWrite III Document |
| Estensione XYP | N/A | XY Write III Plus Document |
| Estensione XYS | Donald Lessau | XYplorer Script Format |
| Estensione XYW | N/A | XYWrite For Windows 3x/4.0 Document |
| Estensione XYZ | N/A | Molecule Specification Format |
| Estensione XYZE | N/A | Radiance Map |
| Estensione XYZI | N/A | 3rdTech Scanner |
| Estensione XYZRGB | N/A | 3rdTech XYZ RGB Graphic |
| Estensione XYZV | Celestia Development Team | Celestia Sampled Trajectory Format |
| Estensione XZ | Tukaani | XZ Utils Compressed Archive |
| Estensione XZFX | ZipLogix | ZipLogix ZipForm Format |
| Estensione XZM | Slackware Linux, Inc. | Slackware Linux Package |
| Estensione X_B | Siemens PLM Software | Parasolid Document Format |
| Estensione X_T | Siemens PLM Software | Parasolid File Format |
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