> That's basicaly it all the videos are getting downloaded as HTML files. Here
is an example of one of the file names (download_video51cb.html). When I
browse the site online and click on a link to download one of the movies it
downloads as a quicktime movie without any problem.

Well what is the contents of the HTML file?  Is it the movie itself, but with
the wrong filename?  I imagine you will find that on those HTML pages there is
crazy javascript to determine what video player to use.  Video is usually hard
to download.