Do not unzip your arcade files. MAME is coded to read the game files directly inside their .zip or .7z containers. Unzipping them will prevent the emulator from recognizing the game. Step 3: Organize Directories
Optimizes arcade emulation on the Nintendo Wii, PlayStation Vita, and 3DS. How to Set Up MAME 2003-Plus ROMs Mame 2003 Plus Roms Archive