Hi Chris and Charles, always contact the source first! :>) I'm surprised- are you sure you have Autorun settings enabled for DVDs Chris? If so, I would think there is a security setting blocking autorun.
Secondly, don't play the MP4, just open the html of the table of contents page and click the links to the tutorials you want to watch. They should play in your browser. If not, again- there is a security setting blocking normal operation.
Lastly, you could open the player.html instead of the mp4, this will at least let you take advantage of the extra features like chapters, closed captions, etc.
Thanks guys!