yes,
try gspot   , I'll let you find the link cos I cant be arsed. (google)
once installed and started drop ya file onto it and hit the render button it
will tell ya whats missing.
www.videolan.org     has played just about everything Ive thrown at it.
try it too

There is also a thread about codecs in this news group
look below or use google.


"skab-t" <xk54@kt-el.com> wrote in message
news:40d2c391$0$19841$44c9b20d@news2.asahi-net.or.jp...
> got an .avi download of family guy the other day from bittorrent, but
having
> trouble playing it. Quicktime Pro, Windows Media player and DivX are just
> not interested in it. Anybody now how i can determine the exact codec of
the
> file?
>
> Thanks
>
>