The Microsoft Excel™ Old Binary file format is a binary file format used by the Excel program in the Office suite between versions 2 and 5. The format is a common format supported to various extents by most spreadsheets although it is incompletely documented. The Gnumeric project has reversed engineered all of the core features of the format.
| Name: | Excel |
| Extensions: | .xls |
| Compatible Programs: | Microsoft Excel, Microsoft Office, and many other spreadsheets |
| Open / Save: | Both |
Supported by the 'MS Excel (tm)' plugin.
These are binary file formats.
A number of other programs are able to process files in the Microsoft Excel file format.