| xix | Microsoft IIS NNTP Subject Lists |
| xjf | OmniPage BatchManager Job |
| xjsw | Tarsia Puzzle Data |
| xkb | X Keyboard Extension Data |
| xkm | X Keyboard Compiled Keymap Data |
| xkp | X-Keys Pro Data |
| xkt | Keysight Calibration Kit Data |
| xl2 | XL2 Analyzer Data |
| xl2r | XL2 Analyzer Data |
| xla5 | Microsoft Excel 5 for Mac Add-in |
| xlamenx | Egis Encrypted Excel XLAM Document |
| xlb4 | Microsoft Excel 4 for Mac Toolbars Data |
| xlb5 | Microsoft Excel 5 for Mac Toolbars Data |
| xlb8 | Microsoft Excel 98 for Mac Toolbar Setup |
| xlbn | Microsoft Excel for Mac Toolbar Setup |
| xldb | XLerator Database |
| xle | XML Cooktop File |
| xlg | Autodesk AutoCAD XREF Log File |
| xlgc | Prosystech ExpressK Database |
| xli | 3D Studio Max IGES Input Log |
| xlkf | ABB RobotStudio License Key |
| xlm3 | Microsoft Excel 3 for Mac Macro Data |
| xln | Excellon Drill File |
| xlo | 3D Studio Max IGES Output Log |
| xlo | Autodesk Inventor Export Journal |
| xlog | XLOG XML Log |
| xlp | SAP BO Xcelsius Add-On Package Project |
| xlsbenx | Egis Encrypted Excel XLSB Document |
| xlsmenx | Egis Encrypted Excel XLSM Document |
| xlsxenx | Egis Encrypted Excel XLSX Document |
| xltbcd | XL Toolbox Chart Design Data |
| xlts | Umbraco Pro Data |
| xlx | SAP BO Xcelsius Add-On Package |
| xlz | Crossword Power Tools Crosswords Library |
| xm3 | Examiner Assessment Item Bank Data |
