Have heard "rumors" that MixW 3.0 version may do this. It is in beta testing now, no release date yet. Also check out Ham Radio Deluxe, that may be the next competitor to MixW. Ham Radio Deluxe: http://www.kns.ch/sysgem/hb9drv/HamRadioDeluxe.htm
Guess the best way if you have MixW or other soundcard software, keep the rig off and try the different modes and listen to what they sound like on your speakers when you press the TX button, with a litte listening, you can determine what mode it is by the sound.