So, if I wanted to test out and see if a certain unsupported game would work with a currently supported profile, what do I need to do?
Do I just go to any one profile and select “Create a new profile based on this one” and proceed to add the exe file path to the unsupported game to test it out?
Yep, pretty much. The only other suggestion, which you probably already know (I’m sure you do, but just in case) is that you should find a profile with the same engine while keeping the year of release in mind (the closer the higher the probability of compatibility).
Here are engine checking resources: http://rjkole.com/gamestuff/engines/index.php
^^This one^^ is the best because it has VorpX information, but there are other resources, like wikipedia that gives Engine information. Also here are some other resources that generally include engine information: https://www.mobygames.com/ https://www.igdb.com/discover