As for the quality of movies; they could be camcorder movies taken directly in the cinema.....
As for your player problem; you could use the free VLC player with built-in codecs which can play almost all media files. Though to preview a video file you'll have to open it with this player directly out of the Incomplete folder, since the VLC player doesn't work with the LW preview function.
You can download it from here:
http://www.videolan.org/vlc/ 