If I understand your post correctly, you have your MSD124 connected to your computer so you can play CD's and have the sound come out of the computer's speaker system, perhaps through the digital audio port.
The MSD124, like other DVD/CD player boxes, is not a computer data drive. It only knows how to process audio and video information. It cannot read computer programs, nor can it read anything but discs with standard CD digital audio or MPEG-2 video formats. In fact, the owner's manual (download
here), says on page 5, "NEVER play back the following discs. Otherwise malfunction may result! ... DVD-ROM for personal computers CD-ROM for personal computers ..."
I wish I had better news for you, but sometimes things can't work the way we want them to.