A unresolved problem with mime associations is discussed here:
Note: ~/.local/share/applications/mimeapps.list has already been
Two possible problems / solutions are proposed:
Use the MIME Type Editor to change the mp3 association:
Problem: No entry exists for mp3 extensions and no way of creating a new entry ...
Which file(s) is this utility updating. (This is a Xfce environment.)
Perhaps I can add the mp3 association manually?
Some folks speculate that the "stubborn mime problem" may be caused because the file: /usr/share/applications/defaults.list does not exist.
Perhaps I could copy this file from a different distro? Or someone
could post their version that I could edit. Can this file be generated
from the command line?
Any other suggestions / advice on how I can force this audio/decibel association?