Help getting a gameboy emulator to work?

I got the bottom star fox game from this site, and the gameboy emulator which I remember was the same as the one my friend gave me from here. How can I use the gameboy emulator to play this star fox game, I havent got a clue. It’s soooooo much fun, I would greatly appreciate any help- that can be provided to get this working. All I remember is that he had all the files in one folder, and could open the game from the gameboy emulator.