XLSX file extension

Below you'll find information on
known file type that uses the .XLSX file extension.

Microsoft Excel Open Spreadsheet File
Extension Added: November, 15th 2010
Last Updated: November, 15th 2010

Category:Spreadsheet Files
Popularity: (Very common)
Spreadsheet file created with newer versions (2007 onwards) of Microsoft Excel. These .XLSX files contain data and all embedded objects such as graphics and buttons etc.

Rather than sticking with their proprietary .XLS format, Microsoft decided to move towards a more open format called Open XML. This new direction applies to all Office applications (for example, .DOC files become .DOCX) and should make it easier for other developers to support the format.

Earlier version of Excel can still open and created XSL files by downloading the free compatibility pack available on Microsoft's website.