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In technical terms, an "archive" is simply a curated collection of ROM files (usually compressed as .zip ) that are specifically hashed (CRC32/SHA1) to match the MAME 2003 Plus core.

Game loads, then immediately exits back to menu. Solution: Open the RetroArch log. Most likely a missing BIOS. Verify neogeo.zip contains the proper CRC files (2512c0d7 for the Neo Geo BIOS).