.avi xvid video with multiple language tracks, turn off in WMP, How?

Running Win XP and WMP 11. Downloaded a .avi file encoded with xvid. When played in VLC it palys perfectly with only one audio track, however in WMP 11, I get a directors commentary over the top as well. How do I turn it off? The only possible options I see are under the "Play" menu "Audio and Language Tracks", but "default" is the only option.
Any ideas much appreciated. Thanks in advance
thanks. I downloaded the xvidcore.dll, but still no luck, any idea what I should do next.