Super-Widescreen Video (Dual Monitors)

I now have a dual-display setup thanks to a friend. I've got two displays set at 1280 x 1024 with the nView settings set so that they act as "One large horizontal desktop" with a resolution of 2560x1024. I'm trying to get a movie to play fullscreen across BOTH at once, but all I get is video on ONE of the monitors, and on the other it stays blank. If I drag a video window across the two screens. whichever screen is displaying a greater percentage of the video is the one where the video actually shows up - cut off wherever it is. The other side just shows black. I don't get it... Windvd and WMP both do that. Quicktime however, plays across both, but that doesn't play DVDs! HELP!!! Thanks.

UPDATE: InterActual DOES play across both screens, but that player is terrible, as I'm sure you know.