Not sure if this was covered already, but i have ulead dvd workshop 1.3 and as most know if you want to use an ac3 audio it has to already be muxed in with your video stream, as selecting "replacment audio" for an ac3 import does not work. That is until now, i was bored and started messing with ulead, and i found that if you rename your .ac3 to an .mpa it sees it as this but still identifies it as an ac3 stream and it lets you import the single stream as a replacment audio!! It authored the disc with no problems.

I am aware of their new ac3 powerpack but who wants to shell out another 200$. Normally i use Maestro but for those disc where i want to make one as fast as possible i will use this app. have fun, again sorry if this was laready covered