Volgens mij moet het hiermee gaan, run file en kijk bij extensie mp3 wat er bij jouw staat en verwijder diegene die jij weg wilt hebben.
Zoek even oo onderstaande site naar de kleine file en download deze.
Clear Dynamic "Open With" Lists
Copyright 2002 - Doug Knox
When you right click on a file in Windows XP, one of your options is Open With. This listing of programs contains some that are predefined and some that are added because you chose a program that wasn't on the list. Over time this list can build up to quite a number of programs.
Clear Open With Lists will allow you to selectively remove the "dynamic" portion of this list for a file extension that you choose (from a list). Or, if you prefer, you can remove all "dynamic" entries for all file extensions.
Future enhancements include the ability to select multiple extensions and/or individual "dynamic" entries.
Operating System(s): Windows XP Only. This utility will run on other OS's, but has not been verified to work. VB 6 Runtime library required (included in Windows XP).
Download Clear Open With Lists here.
http://www.dougknox.com/xp/utils/OpenWithClear.zip
Mike