AVI only plays in window mode

Hi,
i'm tring to play an avi with the following code (6.22 Com):

...
media_play("grundrisse.avi", bmpPCMovieBG, 100); // Media play
x = media_handle; // save Handle
pnlSignPCAni.visible = on; // open Movie Panel
wait(2);
while(media_playing(x)!=0)
{
wait(1); // wait for avi to end
}
...

everything works fine in engines window mode. If i run the engine in full screen the debugger returns the media_handle with 0.
Anybody knows a solution?

I found an solution by myself. It seems that the engine doesn't like the used codec (Radius Cinepak). I used another codec and it works fine (except the worse quality of the other codec). The fact that all avis supposed to run with the engine that run under direct x seems to be very wrong...
Any comments?

hey i can't play any vid its annoying, no wmv, or .avi, or whatelse could it be the codek??

Only Comm or Pro can play movies.