Excel 2/3/4 Worksheet (BIFF2-4), made by Microsoft (1987-1994). Excel files created before Excel 5 use a flat BIFF format that current Excel blocks.

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Upload the .xls file to OldFileOpener, pick XLSX, PDF, ODS, CSV and download the result. Alternatively open it with LibreOffice Calc.

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Yes. OldFileOpener can convert it to XLSX, PDF, ODS or CSV. Values, formulas and formats convert; Excel 4 macro sheets are imported as text.

.xls Spreadsheets

Excel 2/3/4 Worksheet (BIFF2-4)

Excel files created before Excel 5 use a flat BIFF format that current Excel blocks.

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Values, formulas and formats convert; Excel 4 macro sheets are imported as text.