can't open mpg2 in quicktime

i compressed via final cut compressor a movie (36min) to mpg2,
and quicktime is telling me that it's not a movie file!
Vlc open it without a problem...
but i have to open it with quicktime!


pleas help' I'm really stuck!

 

so, vlc open it with no problems

but quick time needs this extra component?

i've converted a short pice of the long movie via
visual-hub, and quicktime did open the mpg2.
so maybe I'm doing something wrong with the
settings in the compressor?