OK I got it working for asf and .asx (if the .asx file has a size). I haven't tested it with .asx files that stream from another server... nor do I care if those work or not.
Chuck, can you help me with getting mp4 files to work? I got one to work, but only because that computer has certain codecs and I guess the WMP on that computer could handle mp4s, but on other computers the video would never run. Is it possible to get it to work on all computers? Mp4s seem like the new popular video extension so I was really hoping to get them to work on my PP powered site.