Format
Microsoft Office Open XML
Summary
- Name
- Microsoft Office Open XML
- Version
- 2007 onwards
- Identifiers
- PUID: fmt/189
- Format type
- Aggregate
- Description
- 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.
- Source
- Digital Preservation Department / The National Archives
- Developed by
- Microsoft Corporation
- Supported by
- Microsoft Corporation
Relationships
- Has priority over
Internal signatures
Microsoft Office Open XML
- Note
- Signature represents a combination of OOXML specific bytes and a standard ZIP signature (taken verbatim from Zip format sig). Last two bytes of this signature represents a Microsoft Open Packaging growth hint which indentifies this as one of three OOXML document types so far.
Byte sequences
- Min Frag Length
- Absolute from BOF
- Offset
- 0
- Max offset
- 0
- Byte Sequence
504B0304{26}5B436F6E74656E745F54797065735D2E786D6C20A2*504B0102*504B0506- Endianness
- Little-endian