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Office Open XML (OOXML) format was introduced with Microsoft Office 2007 and became the default format of Microsoft Excel ever since. Excel-related file extensions of this format include:.xlsx – Excel workbook.xlsm – Excel macro-enabled workbook; same as xlsx but may contain macros and scripts.xltx – Excel template
The Microsoft Office XML formats are XML-based document formats (or XML schemas) introduced in versions of Microsoft Office prior to Office 2007. Microsoft Office XP introduced a new XML format for storing Excel spreadsheets and Office 2003 added an XML-based format for Word documents.
The Office Open XML file formats are a set of file formats that can be used to represent electronic office documents. There are formats for word processing documents, spreadsheets and presentations as well as specific formats for material such as mathematical formulas, graphics, bibliographies etc.
In 2000, Microsoft released an initial version of an XML-based format for Microsoft Excel, which was incorporated in Office XP. In 2002, a new file format for Microsoft Word followed. [ 9 ] The Excel and Word formats—known as the Microsoft Office XML formats —were later incorporated into the 2003 release of Microsoft Office.
Microsoft Office 2013, 2016, 2019, 2021 and Microsoft 365 continue to read and write files that are conformant to ISO/IEC 29500 Transitional by default. Microsoft Office 2013 and later fully support ISO/IEC 29500 Strict, [73] but do not use it as the default file format because of backwards compatibility concerns. [74]
Predecessor file format Microsoft Office XML formats: OpenOffice.org XML: Standardized by Ecma International, ISO/IEC: OASIS, ISO/IEC: First public release date 2006 2005 First stable version Ecma International Standard ECMA-376 Office Open XML File Formats 1st edition OASIS OpenDocument Format for Office Applications (OpenDocument) v1.0
The most widely used office productivity packages currently rely on various proprietary and reverse engineered binary file formats such as those created by successive releases of Microsoft Word, PowerPoint and Excel. However, OOXML is a new format which is not backwards or forwards compatible with any of the old Microsoft Office formats. [111]
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