How do I play alternative audio tracks for XviD/DivX movies?

[Neowulf]

Ok, so here's the question:

I have a XviD/DivX file and a separate MP3/AAC. Now I want to play the XviD/DivX file with the MP3/AAC audio track instead of the original (merged within the XviD/DivX). How do I do?
Obviously, this is a lot more effective than having to download/encode a new DivX/XviD file with just a different audio track, so I'm hoping this feature is present...

And yes, I've checked the FAQ, Wiki and so on. Can't find any info about it.

Thanks in advance!

[Hugh of Borg]

I would also be interested in the solution of this problem.

if someone knows how to do this with vlc please help us