Error: Excel cannot open the file 'export.xlsx' because the file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file.

When attempting to export anything within the application to .xlsx, a user may receive Error:  Excel cannot open the file 'export.xlsx' because the file format or file extension is not valid.  Verify that the file has not been corrupted and that the file extension matches the format of the file.
We are currently evaluating this issue and will update this article when we have more information.

Workaround:  Export to .csv

Environment

 3.0.516, patch 41

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