As in-you rendered a DVDAS video only stream, and now you need the audio? Click the "advance render" button on the render menu. Then you'll see a drop-down list, including .WAV as one of the options. This is what you want. Name it the exact same name as your video except change the .mpg to be .wav and put it in the same folder. This way DVDAS will automatically pick it up to be the audio to your video. It will create the PCM file (which is basically a wav file).