Did you try previewing from the search results or downld window. Choose downld window. Keep in mind very large video files might take some time to load & open.

Try this, get VLC: http://www.videolan.org/vlc/ (choose nearest mirror site), & install it. Make it your default video program. Then try previewing the file. To find out how to make it your default see Setting Default video app

If later you'd prefer VLC not to be your default video player, that's fine, just revert the defaults back as described.