I'm not sure about the specifics of the software you're talking about, but in general, going from 16-bit to 24-bit means you'd have a 16-bit recording being described by a 24-bit file, in short, it's ...

I'm asking this question for a friend who uses his computer to remaster audio. He has a Dell and a standard AC97 soundcard. For music, he uses Cool Edit to remaster CDs/MP3s to 20bit then burns them ...