Office Open XML

Also known as OOXML, OpenXML

family of document file formats mostly known for use with Microsoft Office 2007 and newer

Key facts

Filename extension: .docx, .docm
Internet media type: application/vnd., openxmlformats-officedocument., wordprocessingml., document
Developed by: Microsoft , Ecma , ISO , IEC
Initial release: 7 December 2006 ; 19 years ago ( 2006-12-07 )
Latest release: 4th edition, 26 October 2016 ; 9 years ago ( 2016-10-26 )
Type of format: Document file format
Extended from: XML , DOC , WordProcessingML
Standard: ECMA-376, ISO/IEC 29500
Open format: Yes
Website: ECMA-376 , ISO/IEC 29500-1:2016

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Article

Office Open XML (also informally known as OOXML) 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. Microsoft Office 2013 and later fully support ISO/IEC 29500 Strict, but do not use it as the default file format because of backwards compatibility concerns.