spreadsheet Format
XLS File Format
XLS is the legacy binary spreadsheet format used by Microsoft Excel from 1997 through 2003, built on OLE2 Compound Document containers.
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Technical Specifications
| Extensions | .xls |
| MIME Types | application/vnd.ms-excel |
| Category | Spreadsheet |
| Engine Tier | tier1-small-js |
| Magic Bytes / Sniffing | 0xD0 0xCF 0x11 0xE0 0xA1 0xB1 0x1A 0xE1 |
| Opens With | Microsoft Excel, LibreOffice Calc |
| Good For | Reading legacy corporate financial archives and historical reports. |
| Not Recommended For | Large modern datasets exceeding Excel’s legacy 65,536-row cap. |