messed file associations ubuntu mate (audacious opens caja)

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Sometimes after a fresh install can happen that the ubuntu/mate is confused and it does not know which program should be started by which command. Usually when I run audacious it will open Caja or nautilus. Normally the last installed program is opening the graphical file manager. How to fix when audacious and easy tag opens nautilus-caja?

this is the issue of the preferred application settings 
SYSTEM/PREFERRED APPLICATIONS
here you can set which is the default program for audio,video,pictures and also file manager

Ubuntu-mate-file-associations.png

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Martin Satara