Microsoft Excel for Windows 2007 onwards

Writable

spreadsheet

From Microsoft Office 2007 onwards, the core output format of MS Excel has been based on the Office Open XML (OOXML) file format. The ISO standard for OOXML is ISO/IEC DIS 29500. An OOXML file format consists of a compressed zip archive that is designated according to which file type it is. Further detail on OOXML can be found within fmt/189 - Microsoft Office Open XML.

Identify it

Extensions	`.xlsx`
MIME types	`application/vnd.openxmlformats-officedocument.spreadsheetml.sheet`
PRONOM	`fmt/214`
Wikidata	`Q63082925`

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Open it

fmptoolsOpen sourcewrites · MIT License
LibreOfficeOpen sourcereads and writes · MPL-2.0
LibreOffice CalcOpen sourcereads and writes · Mozilla Public License, version 2.0
Q2025399Open sourcewrites · Eclipse Public License 2.0
ABBYY FineReader 11writes · end-user license agreement
Microsoft Access 2000reads and writes
Microsoft Office Outlook 2007writes
WPS Spreadsheet 2013reads and writes
Gretlreads
Microsoft Excelreads · end-user license agreement
Skysitereads

Convert it

To	With	Fidelity	Command and losses
OpenDocument Spreadsheet file format family	LibreOffice	Partial	`soffice --headless --convert-to ods in.xlsx` Layout may shift; macros and some features are not kept.
PDF	LibreOffice	Partial	`soffice --headless --convert-to pdf in.xlsx` Fixed layout: the document is no longer editable.
Comma Separated Values	LibreOffice	Lossy	`soffice --headless --convert-to csv in.xlsx` First sheet only, values only: formulas, formatting and other sheets are lost.

Sources

From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.

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