An "Anniversary Edition" hack is considered a clone ROM. To save storage space, clone ROMs usually contain only the specific code files that were altered. Therefore, to play the modified version, you must keep both the large parent KOF '98 ROM and the smaller anniversary clone ROM in your MAME roms folder. Copyright and Emulation Legality
Custom title screens, altered character color palettes, and sometimes rearranged background music. king of fighters 39-98 -anniversary edition mame rom-