avi files being detected as RIFF audio in nautilus

[Steve Bergman]

I am experiencing a problem with launching files with an .avi extension 
from nautilus.  When the directory listing loads they show to be 
microsoft video.  When I select them they change to "RIFF audio".  If I 
try to launch, mautilus says that it won't do it because the extension 
does not match the detected file type.  The file command says they are 
RIFF little-endian but I know that they are really valid avi files that 
play just fine.  What's up with this?

I am running the current rawhide.

Thanks,
Steve Bergman