I don't believe this to be a newbie Q bec. there is no info about this anywhere. shot in the dark here: any1 know of a program that'll allow you to edit/replace the audio in an ASF file without re-encoding the file to mpg or avi?

I have a 30 minute asf file with horrible sound. It is easy to export it form the file as a wav and clean it up, but I can't seem to find a way to put the wav overtop/replace the sound already in the orginal.

what I CAN do, but don't want to, is export sound to wav then reencode ASF and WAV to an AVI or MPG. I'd like to keep the ASF so i don't lose any quality.