Steve,
I have like 5 minutes but wanted to first say hi and great topic!!
Your Magnavox DVD player is theoretically capable of playing hirez in as much as it will play PCM up to 24/96, on DVD's such as Neil Young (greatest Hits, Live at Massey Hall, etc.) and any other DVD-Video that says it has PCM stereo tracks at 24/96. This is unprotetced and not proprietary, unlike PPCM or MLP (same thing) which comes on a DVD-Audio disc and is playable only on DVD-Audio players (but capable of up to 24/192). Also if you come across discs called DADs or HDADS they have 24/96 PCM on one side (DVD-V) and DVD-Audio-only 24/192 on the other. You can play the 24/96 DVD-V side.
Now, the bigger issue is what to feed this limited amount of 24/96 HiRez to? Well, stereo analog outs of the DVD player is one option (thereby using the inexpensive, but 24/96 nonetheless, DACs in your DVD player). If you want to send the 24/96 to an external DAC (better quality, etc.) you would use the coax output and send it to a yet-to-be-purchased external DAC that accepts coax (SPDIF), which is all but a few. Your vintage amps, preamps, etc...that go after the DAC, are fine!
You could also rip this 24/96 Hirez material off the DVD using DVD Audio Extractor (freeware, see other thread here on ripping DVD music). And although I don't know Nero Burn well enough, it may grab the 24/96 PCM off of DVD-Video discs too (certainly doesn't rip proprietary DVD-Audio/MLP, that's for sure).
I'll jump back in tmrw...gotta go.