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warning "extension does not match expected mime type" every time I open an MS Office file
Richard Keech
Richard Keech
Posted 2015-07-17 22:59
I'm using Office 2010 with Crossover 14.0.3 on Fedora 22.  Office works OK, however every time I open a file I get the message below.  Any ideas?

Crossover Warning

WARNING: The extension of the '<filename.xlsm>' document does not match the expected MIME type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet. This could indicate malicious activity
Striker Leggette
Striker Leggette
Posted 2015-08-19 14:20

Some debug logs would help to diagnose this:

However, I did also find this:

Let me know if the above link helps.


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