> I'd like to know if there are different types of AVI file.
> I have many of them and I see that some of them could be played with
> xine or real play or whatelse, some of them have very poor quality and
> the rest are impossible to play, for example Avidemux can only open
> half of them whereas xine can play others....it seems that each file
> it's different from anyone else.
> I'm really confused, are there different types of compression or what?

Yeah
Both Video(could be MS MPEG4,DivX X.X, XviD, 3ivX an so on and so on...)
and Audio(MS PCM, MP3... you know... a lot)

MPlayer rulez forever i have ALL possible audio & video codecs in it
(downloaded from mplayer's site) so i can play under Linux video files
which couldn't be played under Windoze with inet connection to M$ site for
update!!!