Not to rant, but does anyone actually look at the last release date when they download neorage X? It's frikkin ancient. It has a built in gui because it was literally the first windows-only arcade emulator. It pre-dates the skinnable, windows fe, that's why you can't disable the gui. I should know... in early 2001 It used it's gui as the basis for the first ever fully-skinnable fe.
2001!!!! In internet terms that's like 80 years old. It was a wonderful emulator, but it's dead now, deal with it.