| xls4 | Microsoft Excel 4 for Mac Document |
| xls5 | Microsoft Excel 5 for Mac Document |
| xls8 | Microsoft Excel 98 for Mac Document |
| xlsb | Microsoft Excel 2007 Document |
| xlse | Document Manager Encrypted XLS 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 |
| xlsxe | Document Manager Encrypted XLSX Document |
| xlsxl | Document Manager Locked XLSX 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 |
| xlw | Microsoft Excel Workbook Document |
| xlw3 | Microsoft Excel 3 for Mac Workbook Document |
| xlw4 | Microsoft Excel 4 for Mac Workbook Document |
| xlw5 | Microsoft Excel 5 for Mac Workbook Document |
| xlxml | Microsoft Excel XML Worksheet |
| xlz | Open Language Tools XLIFF Archive |
| xmap | XMind 2007/2008 Workbook |
| xmcd | Mathcad Worksheet Document |
| xmcdz | Mathcad Compressed Worksheet |
| xmct | Mathcad XML Worksheet Template |
| xmind | XMind Workbook |
| xml | Extensible Markup Language File |