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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .X01 | Corel Corporation | Data Files | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .X02 | Corel Corporation | Data Files | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .X05 | Corel Corporation | Data Files | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .X06 | Corel Corporation | Data Files | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .X09 | Corel Corporation | Data Files | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .X1 | X1 Technologies | Data Files | X1 Desktop Search Saved Search Data | X1 | X1 Technologies |
| .X16 | Macromedia | Data Files | Macromedia Extra Document | Adobe Dreamweaver | Adobe Systems Incorporated |
| .X1D | Vicon Motion Systems Ltd | Data Files | Vicon Unprocessed Data | Vicon Nexus | Vicon Motion Systems Ltd |
| .X1S | X1 Technologies | Data Files | X1 Desktop Search Saved Search Data | X1 | X1 Technologies |
| .X1Z | X1 Technologies | Data Files | X1 Saved Search Archive | X1 | X1 Technologies |
| .X5 | Rockwell Automation Inc. | Data Files | Rockwell Software Logix 5 File | RSLogix 5 | Rockwell Automation Inc. |
| .X50 | Jeffrey C. Johnson | Data Files | XTreeGold Help Data | XTree | Jeffrey C. Johnson |
| .XAC | Tilted Mill Entertainment | Data Files | SimCity Societies Game File | SimCity Societies | Tilted Mill Entertainment |
| .XBC | SMART Technologies | Data Files | SMART Notebook File | MimioStudio | Mimio |
| .XBD | Xerox | Data Files | DocuWorks Binder File | DocuWorks Viewer Light | Fuji Xerox |
| .XBIN | Macecraft Software | Data Files | RegSupreme License Data | RegSupreme | Macecraft Software |
| .XBK | SMART Technologies | Data Files | SMART Notebook File | MimioStudio | Mimio |
| .XBT | SMART Technologies | Data Files | SMART Notebook Template File | SMART Technologies Notebook | SMART Technologies |
| .XCD | NetLabs | Data Files | WarpIN Data File | WarpIn | NetLabs |
| .XCH | Link-Assistant.com | Data Files | LinkAssistant Project | LinkAssistant | Link-Assistant.com |
| .XCK | Unknown Developer | Data Files | Extended Crack File | Unknown Software | Unknown Developer |
| .XCN | Broad Institute | Data Files | GenePattern XCN Data File | GenePattern | Broad Institute |
| .XCO | Xilinx, Inc. | Data Files | Xilinx CORE Generator Log | Xilinx CORE Generator System | Xilinx, Inc. |
| .XD | Unknown Developer | Data Files | CCS-lib.2 Examples Motif-CC File | Unknown Software | Unknown Developer |
| .XDB | Symantec Corporation | Data Files | Symantec Virus Database File | Symantec EndPoint Protection 12 | Symantec Corporation |
| .XDF | NASA | Data Files | Extended Disk Format Image | OS/2 | IBM |
| .XDP | Adobe Systems Incorporated | Data Files | XML Data Package | Adobe Acrobat DC | Adobe Systems Incorporated |
| .XDR_TOR | Accelrys Software Inc. | Data Files | Insight II Binary Torsion File | Insight II | Accelrys Software Inc. |
| .XDS | Nintendo | Data Files | DS Game Maker Project File | Invisionsoft DS Game Maker | Nintendo |
| .XDT | Olivier F5MZN | Data Files | Win-Test Extra Data | Win-Test | Olivier F5MZN |
| .XED | Unknown Developer | Data Files | XED Chemical Modeler Input/Output Data | Unknown Software | Unknown Developer |
| .XEF | X-Genics Limited | Data Files | eManager Form Data | X-Genics eManager | X-Genics Limited |
| .XEM | X-Genics Limited | Data Files | eManager Metered Units | X-Genics eManager | X-Genics Limited |
| .XEN | Activision | Data Files | Guitar Hero 3 Data File | Guitar Hero 3 | Neversoft |
| .XER | Oracle Corporation | Data Files | Primavera Project Management Proprietary Exchange Format | Primavera | Oracle Corporation |
| .XFC | Blacksun Software | Data Files | X-Fonter Font Collection | X-Fonter | Blacksun Software |
| .XFD | JetForm | Data Files | FormFlow 99 Form Data File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .XFDF | Adobe Systems Incorporated | Data Files | Adobe Acrobat XFDF File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .XFI | Leslie Lamport | Data Files | Latex Figures File | LaTex | Leslie Lamport |
| .XFO | Syncro Soft | Data Files | XSL-FO Formatted Form | Software602 602XML Form Filler | Software602 |
| .XFR | TIBCO Software Inc | Data Files | iProcess Process Definition File | TIBCO iProcess Suite | Xmarter |
| .XFT | Cay Horstmann | Data Files | ChiWriter Printer Font | ChiWriter | Cay Horstmann |
| .XG0 | Corel Corporation | Data Files | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .XG1 | Corel Corporation | Data Files | Corel Paradox Secondary Index | Corel WordPerfect X8 | Corel |
| .XG5 | Corel | Data Files | Corel Paradox Secondary Index Data File | Corel Paradox | Corel |
| .XGM | Metaphoric Software | Data Files | Techno Toys XG-909 MIDI Drum Machine File | XG-909 | Metaphoric Software |
| .XGO | GeoConcept SA | Data Files | GeoConcept Add-on | GeoConcept | GeoConcept SA |
| .XGP | Open Source | Data Files | Xfire Game Patcher File | XGP | Open Source |
| .XIP | Apple | Data Files | MacOS Signed Archive | Apple Archive Utility | Apple |
| .XIX | Microsoft Corporation | Data Files | IIS NNTP Subject Lists | Microsoft Internet Information Services (IIS) | Microsoft Corporation |
| .XKM | Open Source | Data Files | X KeyBoard File | Linux | Open Source |
| .XLC | Microsoft Corporation | Data Files | Excel Chart | Microsoft Excel | Microsoft Corporation |
| .XLF | Open Source | Data Files | XLIFF Document | Apple TextEdit | Apple |
| .XLG | Autodesk, Inc. | Data Files | AutoCAD External Reference Log | Autodesk AutoCAD | Autodesk, Inc. |
| .XLGC | Prosystech | Data Files | ExpressK Database File | Prosystech ExpressK | Prosystech |
| .XLO | Autodesk, Inc. | Data Files | Autodesk Inventor Export Journal Data | Autodesk Inventor | Autodesk, Inc. |
| .XLT | Microsoft Corporation | Data Files | Excel Template File | Microsoft Excel | Microsoft Corporation |
| .XLW | Microsoft Corporation | Data Files | Microsoft Excel Workspace | Microsoft Excel | Microsoft Corporation |
| .XLZ | CPT | Data Files | Crossword Power Tools Crossword Library File | Crossword Power Tools | CPT |
| .XM3 | Examiner Corporation | Data Files | Examiner Corporation Assessment Item Bank | Examiner System | Examiner Corporation |
| .XMAP | XMind | Data Files | XMind 2007/2008 Workbook | XMind | XMind |
| .XMAS | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .XMCD | Parametric Technology Corporation | Data Files | Mathcad Worksheet File | PTC Mathcad Prime | PTC |
| .XMD | Bitdefender | Data Files | Bitdefender Plugin File | Bitdefender Total Security 2018 | Bitdefender |
| .XMEF | LexisNexis | Data Files | TextMap Evidence Format File | TextMap | LexisNexis |
| .XMI | Object Management Group (OMG) | Data Files | XML Metadata Interchange File | Eclipse IDE for Java Developers | The Eclipse Foundation |
| .XMIT | IBM | Data Files | IBM XMIT Data | Unknown Software | Unknown Developer |
| .XML | Wattle Software | Data Files | XML File | MacroMates TextMate | MacroMates |
| .XMN | Sergei Andrzeevsky | Data Files | Sprintometer Document | Sprintometer Pro | Sergei Andrzeevsky |
| .XMP | Adobe Systems Incorporated | Data Files | Extensible Metadata Platform File | Microsoft Notepad | Microsoft Corporation |
| .XMPSES | Adobe Systems Incorporated | Data Files | Adobe Premiere Elements Data | Adobe Premiere Elements | Adobe Systems Incorporated |
| .XMS | Alexander Gross | Data Files | Music Studio Project | Alexander Gross Music Studio | Alexander Gross |
| .XMX | Autodesk, Inc. | Data Files | AutoCAD External Message Compiled Data | Autodesk AutoCAD | Autodesk, Inc. |
| .XMZ | Starbreeze Studios | Data Files | FastTracker 2 Extended Module | ModPlug Player | Open Source |
| .XNV | PeopleSoft | Data Files | nVision Layout File | PS/nVision | PeopleSoft |
| .XPB | Tony D. Jones | Data Files | XPB! Basic Source Code | XPB! Basic | Tony D. Jones |
| .XPF | Open Source | Data Files | Linux MultiMedia Studio Preset File | LMMS | Open Source |
| .XPJ | Adobe Systems Incorporated | Data Files | RoboHelp HTML Project | Adobe RoboHelp | Adobe Systems Incorporated |
| .XPK | THQ Nordic | Data Files | WWE RAW Model File | Cygnus Hex Editor | SoftCircuits |
| .XPM | XnSoft | Data Files | X11 Pixmap Graphic | GIMP | The GIMP Development Team |
| .XPO | Microsoft Corporation | Data Files | Microsoft Dynamics AX Export File | Microsoft Dynamics AX | Microsoft Corporation |
| .XPR | Parametric Technology Corporation | Data Files | Pro/ENGINEER Part Instance Accelerator File | Dassault Systemes SolidWorks | Dassault Systèmes |
| .XPS | Microsoft Corporation | Data Files | Microsoft XPS (XML Paper Specification) File | Nuance Power PDF Professional | Nuance |
| .XPT | Mozilla | Data Files | Mozilla Firefox Component | Mozilla Firefox | Mozilla |
| .XPW | Intercon Associates | Data Files | Accessible FormNet Fillable Form File | Accessible FormNet | Intercon Associates |
| .XPX | Intercon Associates | Data Files | Intercon FormNet File | Accessible FormNet | Intercon Associates |
| .XR2 | Open Source | Data Files | Xrecode II Registration | Xrecode | Open Source |
| .XRB | XMind | Data Files | XMind Resource Bundle | XMind | XMind |
| .XRDML | PANalytical | Data Files | XRDML Data File | Panalytical Data Collector | Malvern Instruments Ltd |
| .XREF | IBM | Data Files | IBM AIX Cross-Reference Data | IBM AIX | IBM |
| .XRF | Open Source | Data Files | Cal3D XML Materials File | Cal3DViewer | Open Source |
| .XRFF | University of Waikato | Data Files | Extensible Attribute-Relation File Format | Weka | University of Waikato |
| .XRL | SAP | Data Files | PowerDesigner Report File | Sybase PowerDesigner | SAP |
| .XRP | Stand By Soft | Data Files | RationalPlan Project File | Stand By Soft RationalPlan | RationalPlan |
| .XRT | 4pi Analysis | Data Files | EDX Spectrum Export File In Xraytor Format | RevolutionSEM | 4pi Analysis |
| .XRY | MSAB | Data Files | XRY Data File | XRY | MSAB |
| .XSC | Microsoft Corporation | Data Files | Visual Studio Dataset Internal Info File | Microsoft Visual Studio | Microsoft Corporation |
| .XSEND | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .XSF | Microsoft Corporation | Data Files | InfoPath Form Definition File | Microsoft InfoPath | Microsoft Corporation |
| .XSL | Syncro Soft | Data Files | XML eXtensible Stylesheet | Microsoft Notepad | Microsoft Corporation |
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