Finally!
FileMinimizer was not installed, and I still have not found any trace indicating that it ever was, which makes this all the more confusing to me.
What I ended up doing was using a program called
ShellExView to have a look at all shell extentions on the infected system, then through process of elimination, I found one named
? of type
Context Menu. Viewing it in the Registry Editor led me to
C:/Program Files/Common Files/cPaperless/ which contained all the .dlls and such I'd been looking for the whole time. I really don't know how I missed these, but at least I eventually found them.
Here's hoping this will be easier and faster for anyone else with this same problem.