And - of course - you can always decide to use trusted DivX5.2.1 as decoder filter. You can download it (i.a.)
here.
In this connection a warning for Win98 and WinMe users: do
not install DivX6.x codec!
(Note: you only need the codec for playback, so you do NOT need to install the trial Pro-version and/or the DivX Player; also you do not need to "include Google", which are all included in this "bundle"; you can simply deselect these upon installation).