[Chetwood]

Originally Posted by Mosu

All you have to do is execute mkvtoolnix-gui.exe instead of mmg.exe (start menu entry »MKVToolNix GUI«).

Thanks. Being a windows user I skipped over any and all mentions of the command-line as usual

I also think, XP is over, also because M$ offered Win 8 licenses for only 30 € for a while.