I can’t open sdlxliff files in my Studio 2021. When I want to open an sdlxliff in Studio 2021 the file tries to open in my previous Studio 2019. What shall I do?

I'm using Trados Studio 2021 SR 2 that was an upgrade from Studio 2019 SR 2.

When I want to open an sdlxliff file in Studio 2021 the file tries to open in my previous Studio 2019. 

My previous Studio 2019 SR2 doesn't open any file and I get error message "Unexpected exception when initializing view part fragment matches".

In my SDLaccount I only have the licence for Studio 2021. I don't know what to do, please, help!

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