For Windows you need QuickTime Player 7 and QuickTime Pro to convert a video file to a .mov file.
But......it may not playback on your Nikon S1 camera.
Digital cameras can be stubborn (and impossible) about showing a movie that it did not create.
I have the nikon s1, and I'm trying to convert video from my computer to play on the camera. To do this I need a program that can convert mpeg, avi, or wmv to mov. A lot of programs out there do the opposite. Please help.