hello,
when you have a video, there is a video codec and an audio codec. The file you are trying to view has an audio codec that the Blackberry can read, and a video codec that the blackberry cannot read.
here is the list of codecs that the blackberry can read :
http://supportforums.blackberry.com/rim/board/mess
If you download GSpot Appliance for windows, and read the video file with it, it will tell you the name of the video codec. I'm sure it is not supported by Blackberry.
==> if you really want to watch that video with your blackberry, you'll have to convert it to a compatible format. You can do so very easily by reading this discussion :
http://supportforums.blackberry.com/rim/board/mess
The search box on top-right of this page is your true friend, and the public Knowledge Base too:
