No Intervideo AC3 5.1 audio

[acidzero]

Hi! I have Intervideo's WinDVD6 and the latest version of Bsplayer. When I play a xvid movie with 5.1 AC3 audio on Intervideo, it works flawlessy. But when I play on Bspley, it becomes stereo. I've tried to alter the option "intervideo audio" oto 5.1 during the movie but it pops a message " External exception 80000003" and when I close the screen it returns to stereo.

I tried to install AC3filter, but it conflicts with my installed Ac3 codec and it gives stereo sound even on Intervideo. I have Ligos audio decoder and Nero digital audio installed as possibles AC3 decoders. Both works only in stereo, too.