PO file cannot be processed in Studio 2021

I have a PO file which when opened in Studio 2021 triggers the error message:

Trados Studio error message window stating 'This file type is not supported' with an 'OK' button.

However, opening the file in Studio 2022 works fine. 
What could be the cause of this?
Additional information: if I try to preview the file in Studio 2021, I get this:
Trados Studio warning message window stating 'Cannot find file type settings for the preview file' with an 'OK' button.

This happens on two different instances of Studio 2021 CU 10. Resetting the filetype settings to default also did not help solve the problem.

Any suggestion?



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[edited by: Trados AI at 7:01 AM (GMT 0) on 29 Feb 2024]
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