WMP said it didn't recognize the file type and when forced to play it anyway it showed nothing.
VLC just loaded into memory and acted as if there wasn't any video to play.
WinXP SP2
Intel Celeron D 3.33 Ghz
1.5 GB RAM
GeForce 8500GT video card, with this month's drivers installed from NVIDIA's website.
WMP 11
VLC 0.8.6d
(DLing VLC 0.9.4 right now
)