The video file is an HD capture of the TV show "Heroes" pilot. This is the only time I have seen a 3.0 audio track (I'm not sure why it's not 5.1). It took me a couple of seconds to figure out how I was hearing all the sound effects but no dialog! Very strange.

I would think it would be fairly trivial to simply pass through the center channel on a 3.0 (or greater) signal. Virtualize missing channels, but leave existing channels alone?