Yeah but the question was how to remove something that's not on that list.
Check out this article & see if the program you're trying to remove is listed in the .inf file mentioned:
Uninstall Hidden WinXP Programs
You should also check out the program's main folder & start menu folder for anything that looks like an uninstaller.
Sometimes you'll simply be out of luck though, and yeah almost no programs can be properly/fully removed just by deleting their folders. Thus the beauty in programs like GoBack or System Restore which let you roll your computer back to a point in the past. Also, Symantec has a decent program (I think it's Norton CleanSweep that I'm thinking of) that'll track all program installations & create its own uninstaller for them, so that later if the "official" uninstaller doesn't work or can't be found you can use Norton's uninstaller for it.