_XLSX File - What is a ._xlsx file and how do I open it?

Learn about ._XLSX files and view a list of programs that open them.

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What is a _XLSX file? An _XLSX file is a Microsoft Excel spreadsheet that has had its extension changed from .XLSX to ._xlsx . A user or program may have changed the file's extension on purpose or by accident. _XLSX files can be opened in Microsoft Excel and other spreadsheet programs after you rename them to use the .xlsx extension.

More Information _XLSX files are almost always renamed XLSX files. Most commonly, email programs such as Windows Live Mail mistakenly produce _XLSX files. This happens when a user attaches a spreadsheet whose filename ends in . to an email. For example, if you attach a spreadsheet named spreadsheet..xlsx to an email, Windows Live Mail will rename that file to spreadsheet._xlsx . This issue also occurs when users attach .DOC , .DOCX , and .XLS files to emails. While XLSX, and thus _XLSX, files are typically created by Microsoft Excel, they can also be created using other spreadsheet programs, such as OpenOffice Calc or Apple Numbers. After renaming your _XLSX file to use the .xlsx extension, you should be able to open the file in any of those programs.

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._XLSX File Extension

Renamed Microsoft Excel Spreadsheet

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Popularity	3.3 \| 16 Votes

What is a _XLSX file?

An _XLSX file is a Microsoft Excel spreadsheet that has had its extension changed from .XLSX to ._xlsx . A user or program may have changed the file's extension on purpose or by accident. _XLSX files can be opened in Microsoft Excel and other spreadsheet programs after you rename them to use the .xlsx extension.

More Information

_XLSX files are almost always renamed XLSX files. Most commonly, email programs such as Windows Live Mail mistakenly produce _XLSX files. This happens when a user attaches a spreadsheet whose filename ends in . to an email.

For example, if you attach a spreadsheet named spreadsheet..xlsx to an email, Windows Live Mail will rename that file to spreadsheet._xlsx . This issue also occurs when users attach .DOC , .DOCX , and .XLS files to emails.

While XLSX, and thus _XLSX, files are typically created by Microsoft Excel, they can also be created using other spreadsheet programs, such as OpenOffice Calc or Apple Numbers. After renaming your _XLSX file to use the .xlsx extension, you should be able to open the file in any of those programs.

How to open a _XLSX file

After renaming your _XLSX file to use the .xlsx extension, you can open it in any program that opens XLSX files. These include:

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Programs that open _XLSX files

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