Neorage X. I was already collecting SNES and NES games at the time I discovered it. Bought most ports of Capcom arcade games on the SNES as well and some of them had capabilities the arcade version didn't. A NES and SNES emulator might not have gotten a rise out of me if I heard something about it casually but Neo-Geo, that was a different world and one I wished to explore but couldn't due to the extremely high price tag of Neo Geo MVS and AES carts and yet, I could see their arcade games all over the malls back then and people were playing KOF and Neo Geo titles in public extensively. Their console ports especially for fighting games were a lot poorer compared to say...Capcom's so I wasn't satisfied legit wise.
So when I stumbled on a CD with Neorage X, it was like a whole world opening.