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Office Open XML

| type code = | uniform type = | magic = | owner = Microsoft, Ecma, ISO, IEC | released = | latest release version = 4th edition | latest release date = | genre = Document file format | container for = | contained by = | extended from = XML, DOC, WordProcessingML | extended to = | standard = ECMA-376, ISO/IEC 29500 | url = [https://www.ecma-international.org/publications-and-standards/standards/ecma-376 ECMA-376], [https://www.iso.org/standard/71691.html ISO/IEC 29500-1:2016] | open = Yes }} | type code = | uniform type = | magic = | owner = Microsoft, Ecma, ISO, IEC | released = | latest release version = 3rd edition | latest release date = | genre = Presentation | container for = | contained by = | extended from = XML, PPT | extended to = | standard = ECMA-376, ISO/IEC 29500 | url = [https://www.ecma-international.org/publications-and-standards/standards/ecma-376 ECMA-376], [https://www.iso.org/standard/71691.html ISO/IEC 29500:2016] | open = Yes }} | type code = | uniform type = | magic = | owner = Microsoft, Ecma, ISO, IEC | released = (as Microsoft Open XML) | latest release version = 3rd edition | latest release date = | genre = Spreadsheet | container for = | contained by = | extended from = XML, XLS, SpreadsheetML | extended to = | standard = ECMA-376, ISO/IEC 29500 | url = [https://www.ecma-international.org/publications-and-standards/standards/ecma-376 ECMA-376], [https://www.iso.org/standard/71691.html ISO/IEC 29500:2016] | open = Yes }} }}

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. Provided by Wikipedia