Vista default application list.

I need to know the registry key, or whatever else I might need to alter the list of applications usable for playing DVDs. I know all about control panel/default programs/change autoplay settings. Please do not direct me there. The program I would like to use is not on that list currently. What I am looking for is the registry key that controls what is shown on that list.

Well, in the meantime, till I get a real answer, here's the hack for anyone interested. I searched the registery for the key WMP.DVD and replaced the command line that ran wmplayer.exe with my prefered player. This fixed autoplay and right clicking and selecting Play. Still wondering how to do this the 'right' way.