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

[resolution]

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.

[mguardian_north]

If I were you, I'd just keep playing it in VLC. The Windows version of VLC uses its own codecs; but windows uses directshow codecs. So I'm thinking you don't have the official xvid codec installed. You can try installing the latest official xvid codec.
http://www.xvid.org/Downloads.43.0.html
Download xvidcore-1.2.1.zip .
You might also have to disable any other xvid or divx codecs that are installed.