| xgml | Graph Modeling Language XML |
| xgz | MegaBitz XGL Vector Drawing |
| xhf | XHeader Document |
| xht | XHTML Document |
| xhtm | XHTML Document |
| xhtml | XHTML Document |
| xig | XML Instance Generator Document |
| xl | Microsoft Excel Worksheet |
| xla | Microsoft Excel VBA Add-in |
| xlam | Microsoft Excel 2007 VBA Add-in |
| xlax | Microsoft Excel 2007 VBA Add-in |
| xlb | Microsoft Excel toolbar Setup |
| xlc | Microsoft Excel Chart File |
| xlcsv | Microsoft Excel Comma-Separated Values Document |
| xld | Microsoft Excel Dialogue |
| xlf | XLIFF Document |
| xliff | XLIFF Document |
| xline | XLine Mind Map Document |
| xlk | Microsoft Excel XLS Backup |
| xll | Microsoft Excel Add-in |
| xlm | Microsoft Excel Macro Definition |
| xlr | Microsoft Works Spreadsheet |
| xls | Microsoft Excel Worksheet |
| xlsb | Microsoft Excel 2007 Document |
| xlshtml | Microsoft Excel HTML Spreadsheet |
| xlsl | Document Manager Locked Excel Document |
| xlsm | Microsoft Excel 2007 Document |
| xlsmhtml | Microsoft Excel HTML Spreadsheet |
| xlst | OnlyOffice Internal XLSX Document |
| xlsx | Microsoft Excel 2007 Document |
| xlt | Microsoft Excel Template |
| xlthtml | Microsoft Excel HTML Spreadsheet Template |
| xltm | Microsoft Excel 2007 Template |
| xltx | Microsoft Excel 2007 Template |
| xlv | Microsoft Excel VBA Module |