Won't play some vidz
 

First off, great program guys...ok

This is probably a newb question, but I need to know...

Why doesn't some avi files play on WMP but doesn't play on BSPlayer?

Since I install codex that works on all computers i.e Divx, Xvid. Shouldn't it work on all players.
Even worst, when those vidz are played on WMP it lags...