Sorry if I'm beating this to death, but I just found an incredibly simple way to convert the AVS REC709 HD-DVD to MPEG2. I'm sure this is obvious to you folks, but I figured I would post what I learned. I'm curious if there's a flaw in what I did.
First, similar to how VOBs work on DVDs, I simply used COPY /B to append the four EVO (Enhanced VOBs) files on the HD-DVD to make one large EVO.
Second, I used EVOdemux, a free app, to split the EVO file into an MPV file (video) and an MPA file (audio). During the demux I realized that the video encoding in the MPV file was simply MPEG2.
Third, just like with a DVD, I simply renamed the MPV file to MPEG2.
Voila! I seem to be able to load the file in my normal MPEG viewers and everything is fine. Is this all it takes?