You know, for all of the discussion on MPC Stems and other stem software in general, I can't believe I didn't think about doing this earlier - like years ago. Back in the early 2000's, my house had a B&E and we were robbed. They took my studio PC at the time, and it had all of my sample libraries and saved content on it. I did have a backup drive that was tucked away, but I hadn't updated it in a while so I lost a good amount of sample library content.
There was this one remix I was working on, and it had an incredibly unique drum loop that I have no idea where I got it from, and it was gone.
FOREVER. This was back in the day when Reason Projects always needed to point to the samples that were used unless you remembered to self-contain (I didn't for this project). I tried working on the Project with a replacement drum loop, but it never felt the same. I was crushed. I only had an "OK" mp3 stereo rough mix that I had made before I lost everything.
Over the years I looked on and off for the loop, but never found it again. So I gave up. That was over a decade ago.
So, fast forward to today (or rather, 5 years ago when stem software hit the market) and now I (may) be able to lift that original drum loop from that stereo rough mix! Going to give it a try right now.

*UPDATE: OK, so results
may be usable. I tried RX9, they were "meh". I ran it through Gaudio (it's online only but free), and... they actually came out freak'n fantastic. I might actually resume work on this remix. LOL!