Music .mp4 files won't play if they also is listed in Movies extension list, original found by tontsa on IRC & confirmed by me

Problem is that it try to play it as a video file & not as music



h4. Steps to Reproduce
Have some music with .mp4 extension
1. Open MP -> Music & try to play those files
You get an error:
2012-12-15 18:25:54.614452 [ERROR][MPMain(1)]: VideoPlayer9: Failed to render file -> vmr9
2012-12-15 18:25:54.867808 [ERROR][MPMain(1)]: PlaylistPlayer: *** unable to play - \\Some Place In The Universe\Music Volume 01\B\Bob Dylan\1962 Bob Dylan\01 She's No Good.mp4 - skipping track!



h4. Additional Information
If you remove .mp4 as extension for movies, you can play music .mp4 files.
-Manfred- gave me a new Core.dll with a patch which works, so I set this bug to him ;)