Office Open XML Spreadsheet Document, Strict, ISO/IEC 29500:2008, with Microsoft extensions

Readable

other

document file format conforming to ISO/IEC 29500:2008 Strict and including Microsoft extensions

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Extensions	`.xlsx`
MIME types	`application/vnd.openxmlformats-officedocument.spreadsheetml.sheet`
Wikidata	`Q26208253`

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From Wikidata. Updated 2026-10-20.