- 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