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Office Open XML ○˒｜Definition｜1st｜20251119205401-00-⌔

Office Open XML - Wikipedia

Office Open XML

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Office Open XML (also informally known as OOXML)1 is a zipped, XML -based file format developed by Microsoft for representing spreadsheets, charts, presentations and word processing documents. Ecma International standardized the initial version as ECMA-376. ISO and IEC standardized later versions as ISO/IEC 29500.

Microsoft Office 2010 provides read support for ECMA-376, full support for ISO/IEC 29500 Transitional, and read support for ISO/IEC 29500 Strict.2 Microsoft Office 2013 and later fully support ISO/IEC 29500 Strict,3 but do not use it as the default file format because of backwards compatibility concerns.4

Printed 2026-06-28.

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Footnotes

  1. “The Document Foundation, LibreOffice and OOXML”. The Document Foundation. Retrieved 2016-03-22. ↩

  2. “Overview of the XML file formats in Office 2010”. Office 2010 Resource Kit. Microsoft. 5 August 2011. ↩

  3. “XML file name extension reference for Office 2013”. Office 2013 Resource Kit. Microsoft. 26 December 2016. ↩

  4. “XLSX Strict (Office Open XML), ISO 29500-1:2008-2016”. Library of Congress. Retrieved 2018-09-09. ↩

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