problem with recuva

Hi folks!

I've deleted unintentionally the flash memory card of my digital camcorder. I installed Recuva and could recover all video files (format: Quick Time Movie) on my hard disk. Before transferring/copying all the video files again to the flash memory card, I wanted to try to play them on the computer. But it doesn't work, I can't play the video files :( Every time I try, I get an error message from Windows Media Player (e.g. the type/version of this file is unknown). What's the problem? Why isn't it possible to play the recovered video files?

p.s.: I can play all video files on my computer I made with my digital camcorder and which are stored on my flash memory card, only the ones I recovered with Recuva aren't playable... :(

Thanks very much for any help!

Greets