@mikeserv You are not a TeX user, I take it? If not, no reason you would know what an aux file is.
I've been a LaTeX user since the mid 90s or so. And I usually have more curiousity, but TeX is always something I've found... daunting. Still do, really.
An aux file is just a file which TeX (or maybe LaTeX) uses to write down some information to use between invocations.
@mikeserv I see you are keeping the ghost thing.
Personally, I'd favor the Ghostbusters emblem if you are going that way. It's cheerier.