Unable to open TXLF file in Studio.

I am not able to open a TXLF file in Studio 2021. The error message reads: The element names 'xliff' is an invalid child for the XliffProvider element' and under Origin it lists "XLIFF 2.0 v 1.0.0.0". I think Studio is trying to open the TXLF file as XLIFF 2.0, but I do not know why. 

In my old Studio 2019 version, the TXLF file can be opened. Can you please help figure out why it does not work in Studio 2021.

Thank you.

Stefanie