I am using the Blue-Ray video stream format. What is the preferred audio format for Blue-Ray (and I assume you have the two files in the same directory with the same name and the the DVD app will combine them?
The prob with WAVEFORMATEX [ http://msdn.microsoft.com/en-us/library/windows/desktop/dd390970%28v=vs.85%29.aspx ] is that it still has the same file size limitations as any .wav file -- generally you start having problems as you approach 1/2 an hour's worth. Sony's wave 64 does work great however until you do the final render to 5.1 AC3.
> "s there a way to create Dolby True HD?"
VP 12's AC3 encoder setup does include options for stuff like 7.1 -- I don't know how you'd use it, or how well it works if you get it to work, but it's there if you want to experiment.