Well, I am now trying to figure out how to export gnome mime-types (That both Nautilus and assogiate are aware of) to a magic mime file.

Code:
# Magic local data for file(1) command.
# Insert here your local magic data. Format is described in magic(5).
#I really hope I don't have to do this...
20      string          mp4            \b, MPEG v4 system, part 12 revision
!:mime  video/mp4
Code:
file -m /etc/magic -ib VID00004.MP4 
video/mp4; charset=binary
I guess that's progress, but I'd really rather export gnome's list somehow.

Any information would be greatly appreciated