MAME is uniquely strict about its ROM files. Unlike console emulators (where a SNES game file works on almost any emulator), MAME ROMs are often updated, renamed, or split across versions to improve accuracy.

MAME (Multiple Arcade Machine Emulator) 0.139u1 is an older release in the MAME lineage (one of many numbered builds). "ROMs for MAME 0.139u1" usually refers to the arcade game ROM image sets that match that specific MAME release’s expected file structure and checksums. Running an older MAME build with ROMs requires ROM sets that correspond exactly to that release; newer or different-set ROMs often fail verification or exhibit missing content because MAME’s drivers, merged/cloned set organization, and required CHD/data handling change between versions.

(Invoking related search suggestions now.)