If you're looking for converter I'd suggest Super: http://www.videohelp.com/tools/SUPER
Windows Media encoder probably accepts MP4: http://www.microsoft.com/windows/window ... fault.mspx
The reason I'm asking about the file is I want you to upload it as zip file if it's not too large so I can experiment with it and provide some tutorials on how to use those converters. Silverlight the back-end for the player here supports MP4 so I may just go ahead and see if I can make it really easy. Only trouble there is the size of the files.