Windows is NOT going to create a DVD-Audio disc.That's incredible that Windows can create a DVD-A. It didn't ask for whether you wanted DVD-V or DVD-A? The result must be a DVD-A, since the DVD-V format has no MLP (lossless) audio option.
Also, I assume this is Windows 10 you're using. I need to hook up a USB DVD burner to one of my Windows 10 machines and check this out!
In fact it's not really creating anything.