| Extension | File Type | Files scanned | Contributor |
| X | Aurora Editor compiled macro | 122 | |
| X | Magic 3D Easy View object | 258 | |
| X | Microsoft Direct3D Object (binary) | 36 | |
| X | Microsoft Direct3D Object (txt) | 35 | |
| X | Panzer Elite Action game data archive | 2 | |
| X | X1 compressed archive | 5 | |
| X | X1 compressed archive (var) | 2 | |
| X | X68000 executable | 122 | |
| X13 | Hooligans game data archive | 12 | |
| X1F | X Millennium OPM log | 2 | |
| X2D | XML 2D graphics | 9 | |
| X3A | LEGO Mindstorms EV3 Activity | 4 | |
| X3D | Extensible 3D vector graphics (XML) | 222 | |
| X3DB | Extensible 3D vector graphics (binary) | 168 | |
| X3DV | Extensible 3D vector graphics (VRML) | 210 | |
| X3F | Sigma - Foveon X3 raw picture | 14 | |
| X3G | MakerBot 3D print format | 15 | |
| X3P | OpenGPS X3P (ISO 5436-2) | 5 | |
| X64 | X64 and VICE emulators disk image | 2 | |
| X83 | GAEB-Format X83 | 17 | |
| X83 | GAEB-Format X83 (UTF-8) | 8 | |
| XA | Maxis XA Audio (generic) | 4 | |
| XA | Maxis XA Audio (music) | 2 | |
| XA | Maxis XA Audio (sound/speech) | 2 | |
| XAB/XDB/XGR/XPF/XSS/XTX | Ability document | 43 | |
| XAD | Exotic AdLib module | 6 | |
| XADL | nexarco Application Definition | 7 | |
| XADML | XML-based Application Description information | 203 | |
| XAF | 3ds Max XML Animation File | 4 | |
| XAF | Cal3D Xml Animation File | 7 | |
| XAF | XPEC Entertainment game Archive Format | 2 | |
| XAGT | XML AGTable | 6 | |
| XAIML | eXtended Artificial Intelligence Markup Language | 51 | |
| XAML | Microsoft Extensible Application Markup Language | 22 | |
| XAML | Microsoft Extensible Application Markup Language (Unicode) | 12 | |
| XAMLX | Visual Studio Workflow service data | 10 | |
| XAN | Xantippe project | 7 | |
| XANIM | FSX Aircraft Animation | 5 | |
| XAP | Silverlight Application Package | 62 | Kosmatch Eugene aka xoxmodav |
| XAP | Silverlight Application Package (encrypted) | 8 | |
| XAP | XACT Project | 8 | |
| XAPK | Compressed Android Package | 26 | |
| XAR/PKG/XIP | XAR Archive | 16 | |
| XAR | Xara drawing | 21 | |
| XB | XBIN image/palette/font data | 11 | |
| XBAP | XAML Browser Applications | 18 | |
| XBCD | Xilinx internal data | 12 | |
| XBD | Xilinx Board Description format | 12 | |
| XBD | Xilinx Board Description format (with rem) | 12 | |
| XBDR | Darkroom Booth template | 10 | |
| XBE | XBOX executable | 14 | |
| XBEL | XML Bookmark Exchange Language | 8 | |
| XBF | XAML Binary Format | 5073 | |
| XBG | Xbox Dashboard 3D model | 100 | Masamune3210 |
| XBK | SMART Board Slide Collection | 10 | |
| XBM | X Bitmap | 12 | |
| XBRL | eXtensible Business Reporting Language | 14 | |
| XBRL | eXtensible Business Reporting Language (UTF-8) | 4 | |
| XBS | XnConvert configuration | 18 | Peter Glasl |
| XBV | XBV video | 3 | |
| XCCOLORTHEME | Xcode Color Theme (old) | 20 | |
| XCD/XTC/XWC | Starbreeze Studios game data archive | 3 | |
| XCDL | nexarco Class Definition | 6 | |
| XCF | GIMP image format | 10 | |
| XCF | ispVM chain setup | 10 | |
| XCI | Trimmed Nintendo Switch Game Cartridge (NX Card Image) | 366 | Eric |
| XCI | XCI game engine main project | 4 | |
| XCI | XCI game engine main project (with rem) | 4 | |
| XCLF | Source Insight Custom Language File (XML) | 10 | |
| XCR | XCR archive | 2 | |
| XCSCHEME | Xcode Scheme | 20 | |
| XCWORKSPACEDATA | Xcode Workspace Data | 6 | |
| XD | Adobe Experience Design project | 7 | |
| XDB | Ability DataBase | 5 | |
| XDB | GRC SpinRite Hypertext/Help format | 5 | |
| XDB | HyperText VSUM | 7 | |
| XDB | PageFocus DataBase | 50 | |
| XDB | V-BASE Virus data | 2 | |
| XDB/HLP | xText compiled Hypertext/Help | 7 | |
| XDC | DarkCryptTC XDC encrypted container | 1 | Alexander Myasnikov |
| XDD | WINDEV HFSQL DB XML analysis | 8 | |
| XDD | XFIT XDD format data file | 8 | |
| XDELTA | Xdelta binary differential data (generic) | 3 | |
| XDELTA | Xdelta binary differential data (old) | 2 | |
| XDF | Microsoft Machine Learning Server Data File | 4 | |
| XDF | TunerPro Definition | 12 | |
| XDF | TunerPro Definition (XML) | 30 | |
| XDF | X68000 Floppy Disk image | 6 | |
| XDF | X68000 Floppy Disk image (Human68k formatted) | 17 | |
| XDI | WinArchiver Extended Disc Image | 5 | |
| XDI | Xpack DiskImage compressed archive | 5 | Joerg Jenderek |
| XDM/XWD | X-Windows screen dump (X10) | 2 | |
| XDM/XWD/DMP/X11 | X-Windows screen dump (X11) | 6 | |
| XDMF | eXtensible Data Model and Format | 7 | |
| XDO | Formula Graphics animation | 353 | |
| XDP | XML Data Package | 61 | |
| XDR | X-CAD Drawing | 8 | |
| XDR | XML-Data Reduced | 23 | |
| XDS | LCDStudio Design | 14 | |
| XDT | Termbase definition | 13 | |
| XDV | X86 Delta Compiler Video | 7 | |
| XDW | DocuWorks File | 11 | |
| XDXF | XML Dictionary eXchange Format | 9 | |
| XE2 | XEphem catalog (v2.x) | 5 | |
| XE3 | XEphem catalog (v3.x) | 3 | |
| XEB | Apabi eBook | 2 | |
| XEL | Microsoft Expression Encoder Live jobs data | 8 | |
| XEP | XenoDream Graphics Data | 8 | |
| XER | Primavera's proprietary exchange format | 6 | |
| XER | Primavera's proprietary exchange format (v7.x) | 4 | |
| XER | Primavera's proprietary exchange format (v8.x) | 3 | |
| XEX/EXE | Atari XE Executable | 25 | |
| XEX | Atari executable MSX music | 14 | |
| XEX | Xbox 360 Executable | 21 | |
| XEX | XeX page definition | 3 | |
| XFB | Binary Device Interface File Format | 4 | |
| XFBIN | XFBIN CPK game data container | 3 | |
| XFBIN | XFBIN NUCC game data container | 6 | |
| XFD | Acu4GL/AcuCOBOL Extended File Descriptor | 9 | |
| XFDF | XML Forms Data Format | 9 | |
| XFDL | XFDL form | 22 | |
| XFDL | XFDL form (base64-gzip) | 59 | |
| XFDL | naxarco Form Definition | 344 | |
| XFERD | Recording / transfer detail | 2 | |
| XFM | MNI Transform File | 8 | |
| XFM | Syntrillium Cool Edit Transform Effect | 136 | |
| XFR | Xfrog organic 3D model | 27 | Kieran O'Donnell |
| XFS | Apocalyptica game data archive | 2 | |
| XFS | Digital Image Design game data archive | 3 | |
| XFS | Sorenson Squeeze Filter | 9 | |
| XFT | 3D Font Creator Font | 26 | |
| XGM | Exient XGS Engine Model | 16 | |
| XGMML | eXtensible Graph Markup and Modeling Language | 8 | |
| XGP | XG5000 Project | 2 | |
| XGR | AX-SHELL Group | 6 | |
| XGR | Ability Graphic | 4 | |
| XGR | GraphEdit Filter Graph Markup Language | 5 | |
| XGS | XACT Global Settings | 5 | |
| XGT | Exient XGS Engine Texture | 11 | |
| XHN | EASE ASCII-format speaker | 36 | |
| XI | eXtended Instrument (generic) | 10 | |
| XIA | Chiasmus encrypted | 2 | |
| XIB | Interface Builder UI resource data (archive) | 11 | |
| XIB | Interface Builder UI resource data (object) | 12 | |
| XIE | MSXiE compressed archive (v1.40) | 7 | |
| XIF | Red Alert replay | 6 | |
| XIF | Text Device Interface File Format | 10 | |
| XIF | eXtended Image File Format bitmap (v2) | 5 | |
| XIF | eXtended Image File Format bitmap (v3) | 2 | |
| XIMG/IMG | Extended GEM bitmap | 10 | Joerg Jenderek |
| XIN | XLR8 - Sentry Chip Composor Instrument | 15 | |
| XIP | Hotbar skin | 14 | |
| XIP | Photo Mechanic metadata | 4 | |
| XIP | Xbox Dashboard data | 22 | |
| XIS | Chiasmus key | 2 | |
| XISE | Xilinx ISE Project | 39 | |
| XISF | Extensible Image Serialization Format (v1.0) | 12 | |
| XISF | PixInsight project | 12 | |
| XKM | Compiled X KeyMap (LSB) | 2 | |
| XKM | Compiled X KeyMap (MSB) | 2 | |
| XKS | IBM Softcopy Reader PDF Extended bookshelf file | 12 | |
| XLAM | Excel Macro-enabled Open XML add-in | 32 | Kosmatch Eugene aka xoxmodav |
| XLAUNCH | Xlaunch settings | 5 | |
| XLCF | Leica XLCF | 7 | |
| XLD | Albion game data archive | 97 | |
| XLE | Levelogger Software XML data Log | 4 | |
| XLEF | Leica XLEF | 12 | |
| XLF/XLIFF | XML Localization Interchange File Format | 32 | |
| XLF/XLIFF | XML Localization Interchange File Format (UTF-16 LE) | 9 | |
| XLG | PageFocus Log | 46 | |
| XLIF | Leica XLIF document | 22 | |
| XLO | Autodesk Inventor Export Journal | 10 | |
| XLR | Microsoft Works Spreadsheet | 39 | |
| XLS/XML | Microsoft Excel XML spreadsheet | 18 | |
| XLS | Microsoft Excel for Mac Spreadsheet (v1.x) | 56 | |
| XLS | Microsoft Excel for Mac Spreadsheet (v2.x) | 31 | |
| XLS | Microsoft Excel for OS/2 worksheet (v.unk) | 2 | |
| XLS | Microsoft Excel for OS/2 worksheet (v2.x) | 14 | |
| XLS | Microsoft Excel for OS/2 worksheet (v3.x) | 12 | |
| XLS | Microsoft Excel sheet | 1047 | |
| XLS | Microsoft Excel sheet (alternate) | 10 | |
| XLS | Microsoft Excel sheet (alternate) | 16 | |
| XLS | Microsoft Excel spreadsheet (v2.x) | 116 | |
| XLS | Microsoft Excel worksheet (generic older format) | 213 | |
| XLS | XLS OrthoTrak format | 16 | |
| XLSB | Excel Binary workbook | 28 | |
| XLSM | Excel Microsoft Office Open XML Format document (with Macro) | 14 | Stefan Buehlmann |
| XLSX | Excel Microsoft Office Open XML Format document | 13 | |
| XLT | Biew Xlat Table | 16 | |
| XLT | IBM i Access Client Translation Table | 6 | |
| XLT | Lotus Translation Table | 19 | |
| XM | FastTracker 2 eXtended Module | 29 | |
| XM6 | XM6 Type-G save state | 16 | |
| XM6 | XM6 save state | 4 | |
| XM7 | XM7 snapshot | 2 | |
| XMB | Super Smash Bros. Ultimate LOD/model parameters | 95 | |
| XMBL | Logger Pro data | 5 | |
| XMCD | Mathcad XML based worksheet | 32 | |
| XMCD | XMCD CD information | 2 | |
| XMCT | Mathcad XML Worksheet Template | 12 | |
| XMD | BitDefender plug-in | 20 | |
| XMDX | SofTest answers data archive | 4 | |
| XMF | Cal3D Xml Mesh File | 32 | |
| XMF | Egosoft X mesh | 4 | |
| XMFG | MediaForge Runtime Player Distribution Project | 8 | |
| XMI | Extended MIDI | 30 | |
| XMI | XML Metadata Interchange | 19 | |
| XMIND | XMind Workbook | 9 | |
| XMIX | eXtensible Music and Instruments Xml | 12 | |
| XML | 7DTD prefabs properties | 507 | |
| XML | ABBYY FineReader OCR document | 4 | |
| XML | ACER REMIT XML format | 4 | |
| XML | ARRI Alexa CodexShot metadata | 23 | |
| XML | AS SSD Benchmark results | 4 | |
| XML | Adobe Substance description | 13 | |
| XML | Advance Steel Settings | 14 | |
| XML | Aiee! adventure | 10 | |
| XML | Akoma Ntoso document | 19 | |
| XML | Android Manifest | 12 | |
| XML | Android compiled View resource | 17 | |
| XML | Art Of Illusion XML scene | 14 | |
| XML | Artweaver Brush | 212 | |
| XML/ATOM | Atom web feed | 13 | |
| XML/ADF | Auto-lead Data Format | 4 | |
| XML | Avorion 3D model | 8 | |
| XML | BIM Content package | 24 | |
| XML | BIM Content package (UTF-8) | 3 | |
| XML | BORGChat configuration | 4 | |
| XML | BORGChat smiles | 4 | |
| XML | Binary Format Description | 6 | |
| XML | BrickLink XML inventory | 4 | |
| XML | Broadcast Exchange Format | 4 | |
| XML | Broadcast Exchange Format (UTF-8) | 3 | |
| XML | C64 Studio theme | 7 | |
| XML | CAPS metadata | 19 | |
| XML | Capella CapXML music notation | 9 | |
| XML | Capella CapXML music notation (UTF-8) | 114 | |
| XML | Catrobat code | 33 | |
| XML | Cinelerra project / Edit Decision List | 62 | |
| XML | Circuit Diagram Component | 6 | |
| XML | Cobertura coverage info | 7 | |
| XML | Code::Blocks lexer | 10 | |
| XML | Compressed COLLADA Digital Asset Exchange | 19 | |
| XML | Construct 2 UI state (XML) | 12 | |
| XML | Construct 2 layout (XML) | 7 | |
| XML | DAISY ebook | 4 | |
| XML | DAISY ebook facade | 3 | |
| XML | DAISY encrypted ebook | 3 | |
| XML | DANS Easy Metadata | 17 | |
| XML | DDL disk image | 4 | |
| XML | DECaxp emulator settings | 4 | |
| XML | DPInst configuration | 5 | |
| XML | DPInst configuration (UTF-8) | 3 | |
| XML | DROID Container Signature Mapping | 19 | |
| XML | DROID Container Signature Mapping (UTF-8) | 7 | |
| XML | DROID Signature File Format | 10 | |
| XML | DSPL - Dataset Publishing Language | 17 | |
| XML | DataCite metadata | 13 | |
| XML | Death Village stage data | 10 | |
| XML | Dioscuri config | 6 | |
| XML | DiskDigger custom filter | 6 | |
| XML | DocuWare XML metafile | 10 | |
| XML | Domino module | 13 | |
| XML | Dorico playback template generator | 10 | |
| XML | Dorico space template | 6 | |
| XML | Dorico stage template | 13 | |
| XML | Double Commander configuration | 6 | |
| XML | Double Commander directory history | 5 | |
| XML | Double Commander favorite tabs list | 4 | |
| XML | DriveImage XML info | 6 | |
| XML | ENVI Regions Of Interest | 10 | |
| XML | Encoded Archival Description | 19 | |
| XML | Entity and Attribute Information | 21 | |
| XML | Entity and Attribute Information (UTF-8) | 3 | |
| XML | EtherTerm dial directory | 4 | |
| XML | Exchange Task Wizard XML | 6 | |
| XML | Exient XGS Engine XML (generic) | 32 | |
| XML | Exient XGS Engine serialized XML | 1901 | |
| XML | Expression Design swatch (v4) | 15 | |
| XML | Expression Media exported XML catalog | 4 | |
| XML | FOMod info | 4 | |
| XML | FTK Custom Carver | 830 | |
| XML | Fabmetheus model format | 103 | |
| XML | FatturaPA | 16 | |
| XML | Final Cut Pro XML Interchange Format | 12 | |
| XML | Final Cut Pro XML Interchange Format (UTF-8) | 10 | |
| XML | FinalBuilder Wizard | 6 | |
| XML | FinalBuilder code completion info | 78 | |
| XML | Flex configuration | 5 | |
| XML | FontCreator Pro transform script | 46 | |
| XML | Forever Dates | 4 | |
| XML | GOM Inspection Exchange Format | 7 | |
| XML | GSplit preferences | 4 | |
| XML | Game Definition File | 7 | |
| XML | Game Definition File (UTF-16) | 6 | |
| XML | Game Definition File (UTF-8) | 12 | |
| XML | Generic XML (ASCII) | 3 | |
| XML | Generic XML (UTF-16 LE) | 2 | |
| XML | Generic XML (UTF-8) | 3 | |
| XML | GenoPro Genogram (unzipped) | 14 | |
| XML | GrandMA2 colors | 3 | |
| XML | GrandMA2 colors (UTF-8) | 12 | |
| XML | GrandMA2 effect | 3 | |
| XML | GrandMA2 effect (UTF-8) | 5 | |
| XML | GrandMA2 fixture | 3 | |
| XML | GrandMA2 fixture (UTF-8) | 29 | |
| XML | GrandMA2 macro | 5 | |
| XML | GrandMA2 macro (UTF-8) | 13 | |
| XML/GBXML | Green Building XML | 24 | |
| XML/GBXML | Green Building XML (UTF-16 LE) | 3 | |
| XML | Gunz Online NPC model | 9 | |
| XML | HP printer usage data | 11 | |
| XML | HandBrake presets | 4 | |
| XML | Hauptwerk installation package info | 15 | |
| XML | Hauptwerk organ definition | 15 | |
| XML | Havok XML format | 8 | |
| XML | Hex Edit binary file format template | 46 | |
| XML | Hexels preferences | 4 | |
| XML | HighMAT author info | 2 | |
| XML | HippoEDIT colors scheme | 14 | |
| XML | HippoEDIT keymap | 7 | |
| XML | HippoEDIT syntax | 36 | |
| XML | HxC Floppy Emulator Disk Layout | 12 | |
| XML | Hydrogen drumkit info | 8 | |
| XML | IBM/Toshiba 4690 POS Transaction Log | 10 | |
| XML | ISO8583 credit/debit card messages | 16 | |
| XML | Internet Archive book scan data | 4 | |
| XML | JavaHelp TOC | 11 | |
| XML | Jeskola Buzz machine preset (new) | 6 | |
| XML | Kate language syntax | 315 | |
| XML | Kate language syntax (UTF-8) | 17 | |
| XML | KiCad XML export | 19 | |
| XML | KryoFlux GUI image profiles | 4 | |
| XML | LandXML (v1.1) | 18 | |
| XML | LandXML (v1.1, UTF-8) | 10 | |
| XML | LandXML (v1.2) | 5 | |
| XML | LandXML (v1.2, UTF-8) | 3 | |
| XML | LandXML (v2.0) | 15 | |
| XML | LandXML (v2.0, UTF-8) | 3 | |
| XML | LaunchBox games data | 12 | |
| XML | Library of Congress Format Description Document | 457 | |
| XML | Linden avatar definition | 32 | |
| XML | Linden skeleton definition | 5 | |
| XML | Logitech Gaming Software keyboard profile | 9 | |
| XML | Lunar DSP script manifest | 4 | |
| XML | MAME software list | 534 | |
| XML | MARCXML | 6 | |
| XML | METS Profile | 49 | |
| XML | METS Profile (UTF-8) | 6 | |
| XML | METS document | 27 | |
| XML | MLT XML | 59 | |
| XML | MPEG-H Audio Scene Configuration | 3 | |
| XML | MSN Messenger log | 34 | Renan (aka "Wizard") |
| XML | MSX software data base | 9 | |
| XML | MSXVR app manifest | 6 | |
| XML | Macrium Reflect backup definition | 9 | |
| XML | Macrium Reflect clone definition | 8 | |
| XML | Marmoset Hexels XML exported drawing | 6 | |
| XML | Maven metadata | 7 | |
| XML | MecaBricks XML unknow parts | 3 | |
| XML | MediaTrace report | 11 | |
| XML | MediaWiki XML export (v1.x) | 19 | |
| XML | Meshmixer printers configuration | 3 | |
| XML | Metashape project info | 13 | |
| XML | Microsoft BizTalk XML message | 3 | |
| XML | Microsoft Office XML Flat File Format (ASCII) | 34 | |
| XML | Microsoft Office XML Flat File Format (UTF) | 35 | |
| XML | Microsoft Office XML Flat File Format Excel worksheet (ASCII) | 6 | |
| XML | Microsoft Office XML Flat File Format Excel worksheet (UTF) | 6 | |
| XML | Microsoft Office XML Flat File Format PowerPoint Presentation (ASCII) | 19 | |
| XML | Microsoft Office XML Flat File Format PowerPoint Presentation (UTF) | 17 | |
| XML | Microsoft Office XML Flat File Format Word Document (ASCII) | 11 | |
| XML | Microsoft Office XML Flat File Format Word Document (UTF) | 13 | |
| XML | Microsoft Project Data Interchange XML format | 20 | |
| XML | Microsoft Project Data Interchange XML format (UTF-8) | 13 | |
| XML | Mixxx MIDI preset | 79 | |
| XML | Mixxx controller preset | 64 | |
| XML | Mono Mconfig configuration | 11 | |
| XML | Mozilla blocklist | 23 | |
| XML | MuJoCo model | 20 | |
| XML | NanoScan SPM data | 2 | |
| XML | NeXus XML data format | 14 | |
| XML | News Industry Text Format | 7 | |
| XML | NewsML file | 15 | |
| XML | Nmap scan results (XML) | 55 | Joerg Jenderek |
| XML | OS X Installer GUI script | 6 | |
| XML | Observing Tool Science Program | 18 | |
| XML | Open Microscopy Environment XML | 17 | |
| XML | Open Screenplay Format document (generic) | 16 | |
| XML | OpenCV XML storage | 18 | |
| XML | OpenPLC Editor project | 25 | |
| XML | OpenShot effect | 82 | |
| XML | OpenShot export preset | 28 | |
| XML | OpenSimulator Land data | 6 | |
| XML | OpenSimulator Region Settings | 4 | |
| XML | OpenSimulator Scene Object Group | 1154 | |
| XML | Out-Of-Box Experience file | 4 | |
| XML | Ozeki MediaGateway configuration | 10 | |
| XML | PAM Dataset | 6 | |
| XML | PC AntiVirus Virus DB collection info | 5 | |
| XML | PCjs Project XML machine configuration | 16 | |
| XML | PDS4 archive | 31 | |
| XML | PEC service info (daticert.xml) | 5 | |
| XML | PEC service info (daticert.xml) (UTF-16 BE) | 4 | |
| XML | PRONOM file format report | 1819 | |
| XML | Panda Security System vulnerabilities info | 8 | |
| XML | Panda Security System vulnerabilities info (UTF-8) | 3 | |
| XML | Parallels DiskDescriptor | 10 | |
| XML | Peach Fuzzer | 5 | |
| XML | Phantom Cine video metadata | 8 | |
| XML | Phenotyping Procedures Markup Language | 47 | |
| XML/PLX/PLXML | Picroma Plasma graphics (XML) | 5 | |
| XML | Playstation Vita VELF template | 10 | |
| XML | Portable Application Description (PAD) | 23 | |
| XML | Portable Application Description (UTF-8) (PAD) | 14 | |
| XML | Programmer's Notepad user preset | 8 | |
| XML | QTI document | 17 | |
| XML | RCross track | 11 | |
| XML | ROR website description | 21 | |
| XML/RSS | RSS web feed | 12 | |
| XML | Rage Maker workspace | 4 | |
| XML | RetroPlatform Player RP9 manifest | 9 | |
| XML | Rosegarden note style | 8 | |
| XML/RG | Rosegarden score (ungzipped) | 67 | |
| XML | SCSI2SD configuration | 7 | |
| XML | SDR CAT command list | 9 | |
| XML | SLnir Nota di Iscrizione al Ruolo | 4 | |
| XML | SOAP Envelope | 3 | |
| XML | SOAP message | 7 | |
| XML | SWTPC Emulator configuration | 10 | |
| XML | SWTPC Emulator configuration (UTF-8) | 3 | |
| XML | Samsung bada OS theme | 52 | |
| XML | Scribus palette | 7 | |
| XML | SequoiaView directory Tree (XML) | 3 | Joerg Jenderek |
| XML | Shapefile Geospatial metadata | 6 | |
| XML | Sleep Study report | 4 | |
| XML | SmartFTP transfer queue | 3 | |
| XML | Snap! project | 18 | |
| XML | Sony Backup'n'Restore data | 9 | |
| XML | Sony X-OCN codec metadata | 10 | |
| XML | SoundHelix configuration | 9 | |
| XML | Spready spreadsheet | 9 | |
| XML | Steinberg kScoreLibrary (generic) | 15 | |
| XML | Synapse 3 Chroma Configuration (unzipped) | 4 | |
| XML | Synapse 3 Chroma Configuration (unzipped) (UTF-8) | 9 | |
| XML | TEI document | 260 | |
| XML | TEI document (UTF-8) | 163 | |
| XML | TestGen XML data | 6 | |
| XML | TfID - Text File IDentifier definition (v0.x) | 55 | |
| XML | The Guest save game | 19 | |
| XML | Tinyseq sequence format | 9 | |
| XML | TrID definition! :-) | 1555 | |
| XML | TrackIR profile | 16 | |
| XML | Trainz Mesh Importer info | 7 | |
| XML | TreeDBNotes syntax config | 20 | |
| XML | TwinCAT Current Configuration | 8 | |
| XML | TwinCAT Target Description | 4 | |
| XML | VCDImager Video CD description | 14 | |
| XML | Visual FoxPro exported XML data | 31 | |
| XML | Vixen 3 exported data | 27 | |
| XML | Vuforia QCAR configuration | 6 | |
| XML | WHDLoad DB | 9 | |
| XML | Waveme diagram | 8 | |
| XML | WellLogML | 15 | |
| XML | Windows Media Player sync info | 4 | |
| XML | XEphem lunar DB | 4 | |
| XML | XML BLAST Output | 8 | |
| XML | XML sitemap | 11 | |
| XML | Xcode Mapping Model | 27 | |
| XML | ZModeler profile | 3 | |
| XML | Zefania XML Bible format | 3 | |
| XML | Zefania XML Bible format (UTF8) | 6 | |
| XML | ZipGenius configuration | 4 | |
| XML | blueMSX theme info | 9 | |
| XML | ksudoku puzzle | 8 | |
| XML | m0n0wall configuration | 6 | |
| XML | openMSX machine/device configuration | 262 | |
| XML | pbnsolve Paint-by-Number XML puzzle format | 65 | |
| XML | xLights network | 5 | |
| XMLBIF/BIFXML | Bayesian Networks Interchange Format | 9 | |
| XMLTV | XMLTV format | 45 | |
| XMLTV | XMLTV format (UTF-8) | 15 | |
| XMOD | Monarch Pro model | 26 | |
| XMOD | XMOD format module | 2 | |
| XMOVE/XML | XMOVE 3D trajectories format | 4 | |
| XMP | Adobe Extensible Metadata Platform | 7 | |
| XMPRJ | nexarco Module | 4 | |
| XMPSKIN | XMPlay Skin (ZIP format) | 213 | |
| XMS | XLR8 - Sentry Chip Composor Music | 13 | |
| XMS | XMS-Tracker module | 32 | |
| XMS | XMash compressed disk image | 2 | |
| XMSGS | Xilinx ISE Messages | 14 | |
| XMU | SmartUML UML diagram | 4 | |
| XMV/FMV/PSS | Xbox Video | 24 | |
| XMX | Autodesk External Message compiled | 2 | |
| XNB | XNA Framework Content Pipeline Binary (Win Phone 7) | 2 | |
| XNB | XNA Framework Content Pipeline Binary (Windows) | 5 | |
| XNB | XNA Framework Content Pipeline Binary (Xbox 360) | 2 | |
| XNB | XNA Framework Content Pipeline Binary (generic) | 619 | Stefan Leviti |
| XNG | XLR8 - Sentry Chip Composor Song | 12 | |
| XNK | Microsoft Exchange Server Shortcut | 17 | |
| XOJO_CODE | Xojo build | 8 | |
| XOM/BDL/KEV/LAF/AUD | Team17 MOIK game data archive | 280 | |
| XOPP | Xournal++ document (ungzipped) | 14 | |
| XOPUS | Exient XGS Engine audio | 19 | |
| XOWA | XOWA Wiki data | 25 | |
| XP0 | Secret Photos puzzle | 7 | |
| XP2 | XPilot NG map | 5 | |
| XP3 | KiriKiri Adventure Game System package | 4 | |
| XPA | Xpack compressed archive | 7 | Joerg Jenderek |
| XPA | Xpack compressed archive (Win) | 6 | Joerg Jenderek |
| XPA | Xpack compressed single archive | 2 | Joerg Jenderek |
| XPADDERCONTROLLER | Xpadder Controller layout | 9 | |
| XPC | Deadly Premonition game data archive | 2 | |
| XPDL | XML Process Definition Language format | 11 | |
| XPF | Cal3D Xml morphanimation File | 4 | |
| XPF | LMMS Preset | 12 | |
| XPF | X-Protector Project File | 6 | .Cryorb |
| XPF | XaoS Position File | 6 | |
| XPF | Xerox Printing Instruction Format | 9 | |
| XPI | Mozilla Firefox browser extension | 130 | |
| XPJ | RoboHelp XML Project | 4 | |
| XPK | DigiBooster module | 5 | |
| XPKF/XPK | XPK compressed data | 8 | |
| XPL | LCDStudio configuration Playlist | 6 | |
| XPL | X-Plane plugin | 20 | |
| XPL | XSetup - plugin | 28 | fenixproductions |
| XPM/C/H | X PixMap bitmap | 31 | |
| XPM | X PixMap bitmap (XPM2) | 5 | |
| XPM | X PixMap bitmap (rem) | 7 | Joerg Jenderek |
| XPO | Disney Animation Studio eXposure Sheet | 3 | |
| XPO | Microsoft Dynamics AX Export (ASCII) | 5 | |
| XPO | Microsoft Dynamics AX Export (UTF) | 20 | |
| XPP | Xerox Presents clipart | 34 | |
| XPR | Expression Design drawing (v1) | 17 | Tyler Thorsted |
| XPR | Expression Design drawing (v3) | 18 | |
| XPR | Expression Design drawing (v3, ASCII) | 7 | |
| XPR | Oxygen XML Editor Project | 13 | |
| XPR | Xbox archive (generic) | 12 | |
| XPRJ | naxacro Project | 4 | |
| XPS | MonkeyJam Exposure Sheet | 2 | |
| XPS | Waves Preset | 7 | |
| XPSM | PixInsight Process Serialization Module | 11 | |
| XPT | SAS Transport (XPORT) format | 26 | |
| XPT | XPCOM Type Library | 251 | Roberto 'rbnet' Bolli |
| XQL/XQM/XQY | XML Query Language | 47 | |
| XRAW | MagicaVoxel palette | 2 | |
| XRC | wxWindows - wxPython Resource | 15 | |
| XRDML | XRDML data | 8 | |
| XREPORT | ISE XReport | 28 | |
| XRF | Cal3D Xml material File | 265 | |
| XRF | Cross-Reference info | 13 | |
| XRM-MS | Microsoft security certificate | 7 | |
| XRM-MS | Microsoft security certificate (Unicode) | 9 | |
| XRNI | Renoise Instrument | 734 | |
| XRNS | Renoise module (w/o samples) | 8 | |
| XRNS | Renoise module (with samples) | 10 | |
| XRNT | Renoise effects chain | 8 | |
| XRP | RationalPlan project | 4 | |
| XRPT | ISE Report | 19 | |
| XRS | Crossrunner saved state | 6 | |
| XS3/XS4/XS5 | XESS worksheet (generic) | 26 | |
| XSA | XelaSoft Archive compressed data | 2 | |
| XSB | XACT Sound Bank | 10 | |
| XSD | DFDL schema | 36 | |
| XSD | XML Schema | 16 | |
| XSF | Cal3D Xml Skeleton File | 8 | |
| XSH | Amapi Shader | 41 | |
| XSH | Artlantis Shader | 11 | |
| XSH | The Hanna-Barbera Animation Workshop animation data | 6 | |
| XSI | SoftImage XSI 3D image | 9 | |
| XSIADDON | XSI Addon | 12 | |
| XSIG | XML Signature | 19 | |
| XSM | Extra Simple Music module | 4 | |
| XSN | InfoPath Dynamic Form - Template | 27 | |
| XSO | Expresso project | 9 | |
| XSP | XBMC Smart Playlist | 9 | |
| XSPF | XML Shareable Playlist Format | 16 | |
| XSQ | xLights Sequence | 62 | |
| XSS | Ability SpreadSheet | 11 | |
| XST | X1R / X Millennium Save State | 2 | |
| XSTAGE | Toon Boon Harmony scene | 4 | |
| XSVF | Xilinx Serial Vector Format | 30 | |
| XTC | Crosstalk Compiled script | 67 | |
| XTC | XTrkCAD project | 34 | |
| XTC | XTrkCAD project (with rem) | 34 | |
| XTD | Crosstalk Driver | 11 | |
| XTF | Crosstalk Filter | 10 | |
| XTF | Xbox Font | 67 | |
| XTF | eXtended Triton Format | 2 | |
| XTG | QuarkXPress Tags | 36 | |
| XTG | eXtensible TreeGraph format | 14 | |
| XTI | TwinCAT Multi Project/Export | 23 | |
| XTM | Xtremsplit file part (v1.1) | 2 | |
| XTODVD | ConvertXtoDVD project | 9 | Ryan Jones |
| XTP | Crosstalk Protocol | 16 | |
| XTP | InfoPath Template Part | 12 | |
| XTP | XTrkCAD parameters | 73 | |
| XTR | XTrkCAD demo | 76 | |
| XTR | XTrkCAD demo (with rem) | 29 | |
| XTRACHART | DevExpress Chart | 20 | |
| XTREME | Winstep Xtreme theme pack | 9 | |
| XTREME | Winstep Xtreme voice pack | 8 | |
| XTT | Crosstalk Terminal | 18 | |
| XTT | XTimeTable Time Table | 3 | |
| XTT | Xbox 360 System Font File | 4 | Masamune3210 |
| XTX | Nintendo Switch swizzled texture | 9 | |
| XUI | Xbox 360 User Interface | 13 | |
| XUL | Mozilla XML User interface Language | 75 | |
| XUS | UpdateStar info | 8 | |
| XVC | MuPAD Uncompressed VCam Graphics | 4 | |
| XVD | Softerm codepage | 5 | |
| XVI | Xbox One Virtual Disk Info | 5 | |
| XVS | XLR8 - Sentry Chip Composor VoiceSet | 12 | |
| XWB | XACT Wave Bank | 3 | |
| XWD | X Windows Dump bitmap | 44 | |
| XWF | Declan Software word file | 12 | |
| XWMA/XWM | XWMA audio | 2 | |
| XWP | XWinPlot layout | 10 | |
| XWRL | XML Virtual Reality Modeling Language | 7 | |
| XWS | Xara WebStyle file | 9 | |
| XX | XX34 encoded data | 106 | |
| XXL | XXL part program (ASCII) | 5 | |
| XXT | Memory Mate database | 11 | |
| XXX | Compucon/Singer PSW Embroidery Design File | 6 | FILExt |
| XY | Stars! game | 5 | |
| XYD | XYPad Drawing | 11 | |
| XYS | SMS XY Series | 3 | |
| XYS | SMS XY1 Series (old) | 2 | |
| XYS | SMS XY2 Series (old) | 2 | |
| XYS | SMS XY3 Series (old) | 2 | |
| XYT | VivaVideo effect | 7 | |
| XYZ | SMS XYZ data | 2 | |
| XYZ | XYZ Graphics bitmap | 2 | |
| XZ | xz compressed container | 200 | Erik Siers |
| XZP | XZP container format | 3 | |
| X_B | Parasolid model (Binary) | 14 | |
| X_T | Parasolid model (Text) | 45 | |
