| xrz | AiM Tech EVO4S Logger Data |
| xs | Hummingbird Exceed Startup File |
| xs8 | SIMUL8 XML Simulation |
| xsb | Sybase PowerDesigner XML Model Backup |
| XMLBeans XML Schema Binary |
| xsbz | Oracle BI Publisher Sub Template |
| xsc | RFM Molecule Cross-Section Data |
| XSENSOR Software Calibration Data |
| xsd | Autodesk AutoCAD Civil 3D Existing Ground Cross Section Data |
| ICQ 6 XSD Data |
| MAPublisher Custom Coordinate System Data |
| xsdif | Altova DiffDog Schema Data |
| xse | EQuIS Data Processor Format Definition Data |
| xseq | xLights Sequence Data |
| xsf | Cal3D XML Skeleton Data |
| IMVU Skeleton Data |
| Xilinx CORE Generator Pin File |
| xsi | Softimage dotXSI 3D Model |
| xsiaddon | Softimage dotXSI Add-on |
| xsig | eCoFirma XAdES Signature Data |
| xsk | XKeyBrew Menu Data |
| xsl | FileMaker Database Design Report Template |
| xsm | Cross Stitch Pro Motifs Data |
| Sybase PowerDesigner XML Model |
| xsn | XSENSOR Software Session Data |
| xyAlgebra Data |
| xso | XKeyBrew Menu Data |
| xsosd | ProgDVB Skin Data |
| xsp | AutoCAD Civil 3D Existing Ground Section Data Pointer |
| MAPublisher XSP Data Source |
| xsprl | X-Setup Pro Data |
| xsprla | X-Setup Pro Data |
| xsr | Bentley GEOPAK XS List Report |
| Tekla Structures FabTrol Report |
| xss | Microsoft SharePoint WorkSpace Groove Database |
| xssz | Oracle BI Publisher Style Template |
| xstage | Toon Boom Harmony Scene |
| xstb | TextBridge Pro Data |
| xstk | xStarter Task Data |
| xsu | UNICOM Sample User XML Data |
| xsum | Netlib xsum Data |
| xsvf | Xilinx Serial Vector Format |
| xsz | ZynAddSubFX Standalone Scale File |
| xtabs | CFi Explorer Tabset Data |
| xtb | Angular Translation Data |
| LocoScript External Translation Table |
| xtd | LabChip XT Data |
| xte | LabChip XTe Data |
| xterme | Winstep Xtreme License Key |
| Winstep Xtreme Theme Pack |
| xtf | LS-DYNA Extra Time History Database |
| xtg | Extensible TreeGraph XML Data |
| xti | Blue Wave Offline Mail Reader Data |
| xtic | ActivInspire Ticker Data |
| xtk | X-Ray Toolkit Metadata |
| xtm | CmapTools Exported Topic Map |
| XtremSplit Data |
| xtmp | Avid Xpress Pro Template |
| xtp | Autodesk AutoCAD Exported Tool Palettes Data |
| Microsoft InfoPath Form Template Part |
| XenoView Template Data |
| XTree Data |
| XTreeGold Overlay Data |
| XTrkCAD Layout |
| xtp2 | Microsoft InfoPath Form Template Part |
| xtpl | XER Manager Template |
| xtr | RealArcade Compressed Data |
| XTrkCad Demo |
| xtrd | MON2020 GC Trend Data |
| xtreme | Winstep Xtreme Theme Pack |
| xtrl | XTND Translator Data |
| xts | IMPS Data |
| xtt | X TimeTable Data |
| xtu | Intel Extreme Tuning Utility Data |
| xtx | Xtext Data |
| xtxt | Xtext Data |
| xui | Xbox 360 User Interface Data |
| xule | XBRL Rules Data |
| xulrunner | XULRunner Data |
| xum | Excel CAPE-OPEN Unit Operation Model Data |
