2 audios
 

When I open the movie I can hear english and, I think, polish. How can I change that, cause I just want to hear the english?
Thanks!

Right click->audio->audio streams, select the one you want.

I tried that, but somwhow there aren't any audiostreams. That was the confusing thing...

Details!!
Container (AVI?)? Audio streams have which format?
MSS (morgan Stream Switcher) installed? It comes with nemo codec pack AFAIK. Don't you ever use those!!!

i think there is only one stream but with two audio tracks in it. One of them must be the main and the loudest. But in your case i think there is an english film translated to Polish so the Polish track is the loudest, just find other version of film, with other translation.

I thought so, but I hoped there was something I can do about it, since it's a really rare movie and I was so glad that I finally found it.
Well, thanks!

Well. You could try to demux the streams with VirtualdubMod, then remux to matroska file or whatever...