Problems with burning a movie

I have a movie (MPEG) with audio and without the dutch titels. After using Subsync and conversion to a ssa file i use VitualDub. So far so good Than I use TMPGen . Burning with Nero 7. After TMPGen i have two files. A MPEG and a windows audio file. Play with DVD power or Windows media give only the movie with ducht titel but now without the audio. What is wrong???