Found the problem...

https://bugs.kde.org/show_bug.cgi?id=321706

The good news is that it's fixed already, you just need to get the version with the fix applied.

Brian Cluff

On 01/15/2014 02:17 AM, Derek Trotter wrote:

delboy@ladmo:~/.local/share/applications$ ls -l mimeapps.list
-rw-rw-r-- 1 delboy delboy 15740 Jan 15 02:06 mimeapps.list

I went into system settings - file associations and added amarok to the
list of files to play mp3 files and moved it to the bottom of the list.
Next I checked mimeapps.list and found the following two lines.

 From mimeapps.list
audio/x-mp3=kde4-amarok.desktop
audio/x-mpeg=kde4-amarok.desktop

Then I went back to file associations and removed amarok from the list
of files to play mp3 files.  I clicked on an mp3 file and vlc played
it.  I went back to look at mimeapps.list and these two lines were still
there.

From mimeapps.list
audio/x-mp3=kde4-amarok.desktop
audio/x-mpeg=kde4-amarok.desktop

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