Office Open XML

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.

"docx" redirects here. For other uses, see docx (disambiguation).
Not to be confused with OpenDocument, Open Office XML, or Microsoft Office XML formats.
Office Open XML
Office Open XML Document
The OOXML Document icon, as appears on the Microsoft OneDrive web service
Filename extension
.docx, .docm
Internet media type
application/vnd.
openxmlformats-officedocument.
wordprocessingml.
document
Developed byMicrosoft, Ecma, ISO, IEC
Initial release7 December 2006 (2006-12-07)
Latest release
4th edition
26 October 2016 (2016-10-26)
Type of formatDocument file format
Extended fromXML, DOC, WordProcessingML
StandardECMA-376, ISO/IEC 29500
Open format?Yes
WebsiteECMA-376, ISO/IEC 29500-1:2012
Office Open XML Presentation
Filename extension
.pptx, .pptm
Internet media type
application/vnd.
openxmlformats-officedocument.
presentationml.
presentation
Developed byMicrosoft, Ecma, ISO, IEC
Initial release7 December 2006 (2006-12-07)
Latest release
3rd edition
29 June 2011 (2011-06-29)
Type of formatPresentation
Extended fromXML, PPT
StandardECMA-376, ISO/IEC 29500
Open format?Yes
WebsiteECMA-376, ISO/IEC 29500:2008
Office Open XML Workbook
Filename extension
.xlsx, .xlsm
Internet media type
application/vnd.
openxmlformats-officedocument.
spreadsheetml.
sheet
Developed byMicrosoft, Ecma, ISO, IEC
Initial release7 December 2006 (2006-12-07) (as Microsoft Open XML)
Latest release
3rd edition
29 June 2011 (2011-06-29)
Type of formatSpreadsheet
Extended fromXML, XLS, SpreadsheetML
StandardECMA-376, ISO/IEC 29500
Open format?Yes
WebsiteECMA-376, ISO/IEC 29500:2008

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.

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