Hi Perenista!
The open file error that you get means that mkvtoolnix.exe couldn't create the new file for the audio.
Seeing the filepath, I believe that you hit the filesystem limitation of 255 characters in path.
Can you try to extract it in a folder with less characters instead of your desktop? For example try to extract it to a "C:\temp" folder and see if this is indeed your problem.
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