Each ZIP includes all necessary parent files and BIOS data, meaning you can move a single game to your device and it will work without needing a separate neogeo.zip or parent ROM.
Use a DAT file from the MAME 2003-Plus GitHub page to verify your files if you encounter "Missing Files" errors. mame 2003plus reference full nonmerged romsets link
: Always be cautious about the legality of ROMs. While MAME itself is legal, the legality of ROMs can depend on how they were obtained. Each ZIP includes all necessary parent files and
To ensure your games actually load and run without errors, you need a "Reference Full Non-Merged" romset that specifically matches this version of the emulator. What is a Full Non-Merged Romset? mame 2003plus reference full nonmerged romsets link