I've noticed that mplayer plays flv files and possibly others much better than vlc and the built in player fails to play them all together. I've also had some success with changing the default application for certain file types so i can download file extensions which were previously unrecognised. I did this by installing nano and editing the defaults.list file with a line that says application/*=Filebox.desktop.

Does anyone know whether it would be possible to add another line to the defaults.list file to make mplayer the default player for certain video files? I was thinking this may fix the problem where you click an embedded video only to find the built in player opens but can't play. Even the old symbian 3 phones could do this! Let alone maemo5