OK now i'm confused, are you running Amiga through MAME as well? If so you likely need the kickstarts for that, but im not even sure if that works in MAME, or if it does i dont know anyone who uses it, they use dedicated Amiga emulators. As for Arcade roms working when you unzip them that makes no sense at all, MAME roms should be loaded in a compressed format, you will just get a error if you load a unzipped rom to MAME, are you sure you actually have correct pack and not the Software List pack for MAME which contains old computer systems and a handful of consoles?