Any way to launch a program/script as screen saver?

[cafevincent]

I found some looping videos and I want to use them as a screen saver. I figure there must be a program that can convert a launch command or a script into a screen saver file. The problem is I can't find any, all "make your own screensaver" progs that I could find seem to be slideshow based. Any help? I'm using Windows XP.