Excel prompts you to grant access to files and then hangs or shows a warning that it cannot open the .xlsx file because the format or extension is not valid

Last Updated: March 25, 2020

ISSUE

You may receive an unexpected prompt to Grant Access to files when you try to open a file or do "Save as..." or "Save a copy". When this happens, Excel may become unresponsive and you will need to force quit the application to recover.

STATUS: FIXED

This issue has been fixed with version 16.34. Please update to this version or newer to address this issue. For help installing the latest Office updates, please visit Install Office updates.

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See Also

Fixes or workarounds for recent issues in Excel for Windows

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