This is quite annoying for me as a composer, since I’m working with multiple files, I want to be able to click on them and open MuseScore, instead of Ark. If I set it to open with MuseScore by default, it makes .zip files open with MuseScore.
This could also extend to .mscx files, being called “MuseScore score file”, since it’s the uncompressed format, or maybe something similar.
You can add your own file extensions with their icons, in the file association section in system settings.
Default File extension association and recognition is defined in Making sure you're not a bot! you can propose your file extension association there if it is common for “.mscx” files.
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