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| Name | XLS |
| Full name | XLS - Microsoft Excel Binary File Format |
| File extension | .xls |
| MIME type | application/vnd.ms-excel |
| Developed by | Microsoft |
| Type of format | Spreadsheet |
| Description | Microsoft Excel up until 2007 version used a proprietary binary file format called Excel Binary File Format (.XLS) as its primary format. Excel 2007 uses Office Open XML as its primary file format, an XML-based format that followed after a previous XML-based format called "XML Spreadsheet". |
| Technical details | OpenOffice.org has created documentation of the Excel format. Since then Microsoft made the Excel binary format specification available to freely download. |
| Associated programs | Microsoft Office, LibreOffice, Kingsoft Office, Google Docs. |
| Wiki | https://en.wikipedia.org/wiki/Microsoft_Excel#File_formats |