File Extension

XLSX File Format

Microsoft Excel Open XML Document

XLSX is a file extension for an open XML spreadsheet file format used by Microsoft Excel.

Microsoft introduced the open XML standard to Microsoft Office in 2007 after a push from business users who saw the value in an open file format for transferring data between applications and other areas of working with the files. Support can also be added to earlier versions of Excel with Open XML component support.

MIME type:  application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

 

 

Learn more about XLSX files:

Visit the Microsoft Excel webpage.

Wikipedia has an entry on Office open XML.

Search for answers to XLSX-related questions at IT Knowledge Exchange.

This was last updated in July 2010
Editorial Director Margaret Rouse

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