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Office Open XML (also informally known as OOXML or OpenXML) is a zipped, XML-based file format developed by Microsoft for representing spreadsheets, charts, presentations and word processing documents. The Office Open XML specification was initially standardised by Ecma (as ECMA-376) and later by ISO and IEC (as ISO/IEC 29500).
Starting with Microsoft Office 2007, the Office Open XML file formats have become the default target file format of Microsoft Office, although the Strict variant of the standard is not yet fully supported.{{cite web |url=http://arstechnica.com/microsoft/news...