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Microsoft Works Spreadsheet

Unknown

spreadsheet

Identify it

Extensions	`.wks.xlr.bks`
Signatures	`000200040405540200` at byte 0 (File Formats Wiki)
PRONOM	`fmt/166fmt/901fmt/270fmt/271`

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Versions and variants (4)

Microsoft Works Spreadsheet 1-5Unknown
Microsoft Works Spreadsheet for Macintosh 3Unknown
Microsoft Works Spreadsheet for Macintosh 4Unknown
Microsoft Works Spreadsheet 6-9Readable

Sources

File Formats Wiki

From Just Solve the File Format Problem (File Formats Wiki). Updated 2026-10-24.

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