Office Open XML 2007 onwards
Writabledocument
Microsoft developed office Open XML (OOXML) in 2007. It is an XML based format representing a departure from previous Microsoft Office suites, which were binary file based. Starting with Microsoft Office 2007, the Office Open XML file formats have become the default file format of Microsoft Office. 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. OOXML uses three custom XML based languages to describe its’ three document types. WordProcessingML, SpreadsheetML and PresentationML are each used to describe Word, Excel and PowerPoint Presentation files respectively. OOXML is not an open format but the specification and development rights have been released under Microsoft’s Covenant not to Sue. OOXML is platform independent.
Identify it
| Extensions | .docx.xlsx.pptx.dotm.ppsm.pptm.xlsm.xltm.xltx |
|---|---|
| Signatures | 504b0304 at byte 0 (Microsoft Office Open XML) |
| PRONOM | fmt/189 |
| Wikidata | Q279979 |
| Library of Congress | fdd000395 |
Not sure your file is this? Identify it from its first bytes, in your browser.
Open it
- LibreOfficeOpen source
- LibreOffice ImpressOpen source
- LibreOffice WriterOpen source
- Q220993Open source
- AbiWordOpen source
- anydocOpen source
- Apache TikaOpen source
- JuliaOpen source
- nomacsOpen source
- Notational VelocityOpen source
- ROpen source
Convert it
No conversion recorded. One of the tools above may export it; search for a chain.
0Versions and variants (40)
Sources
From Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.