Thanks, but the actual solution of course was that there was no problem at all to begin with. I spent two full days trying to fix something that wasn’t broken at all.
I’m running Windows 10 and recently went through their Fall Creators update. What a mess that turned out to be. Microsoft took over damn near everything, and I spent I don’t know how much time trying to get file extensions and default programs and I don’t know what else, back to the way I want them. So when I attempted to use PGCDemux and I thought it wasn’t working the way I thought it should, I just thought the worst. Computers can be great, but they can also be a real pain in the rear.
Anyway, thanks again. It’s nice knowing that if I do have an actual problem, you guys are nearby to help.