MAME ROMs are stored in ZIP archives. To save space, emulation communities created three packaging methods:
Don't forget the samples folder! Place it inside your system/mame2003-plus/ folder so that classic games have their proper chirps, bangs, and whistles. Mame 2003-plus Reference Full Non-merged Romsets Download
Are you still using Split sets, or have you made the switch to Non-Merged? Let us know in the comments below. MAME ROMs are stored in ZIP archives