Unlike console ROMs (like a Super Nintendo .sfc file), MAME ROMs are collections of raw chip dumps (ROMs and disk images). As MAME improves, developers re-dump boards, correct bad data, and rename files. A ROM set built for MAME 0.200 will not work on MAME 0.106.
MAME ROMs are copyrighted software. While MAME itself is open-source and free, the game mame 0106 roms