I almost didn't open this tread because of the title. However, I have a great interest in this topic as I am trying to rip my HD disks to my Innuos Zen.
I am a little puzzled by your remark that DVD-A discs don't seem to have stereo tracks. Since you have an Oppo 105 you can check to see exactly what tracks are there. I have several brands of DVD-a discs and all but one (NAXOS) have stereo tracks. As for getting them to play on the DVD drive of a PC, that is another matter.
I have 3 "Classic" HDADs with 24/96 stereo tracks that should play on a PC, and I will try to copy them using Foobar 2000. I will try to do that this week, and see if I can save them to USB memory sticks to transfer to the Zen. If anyone has any advice on how to, it would be really appreciated.
It seems to me there should be a way to use an OPPO 105 to get the correct track to a PC, and then copy to a USB stick for transfer. Again if anyone has found a way, please advise.
Near future project is to try to move my SACDs to the Zen using the method recommended above.