Popular formats

xlsx 

Opening xlsx files

Have a problem opening a .xlsx file? We collect information about file formats and can explain what xlsx files are. Additionally we recommend software suitable for opening or converting such files.

What is the .XLSX file type?

The .xlsx extension represents the newer Microsoft Office Excel spreadsheet file format, which is part of the broader Office Open XML (OOXML) format. OOXML is a ZIP-compressed XML-based format developed and backed by Microsoft. OOXML is an ISO-/IEC-standardized format, alhtough through a controversial process.

Since the release of Microsoft Office 2007, the .xlsx extension has become the default extension and file type for Excel spreadsheet workbooks. The ending "x" in the extension name is for workbooks without macros, while those with macros would have an "m" instead (.xlsm).

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Software to open or convert XLSX files

You can open xlsx files with the following programs: