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: If you are sourcing files independently, you must ensure your ROM and BIOS come from a MAME 0.149 ROM set . Do not use a "split" set. Look for a "non-merged" ROM set, as these contain all necessary files within the single game ZIP.

Drag and drop the neo.zip file directly into the OpenEmu window (do not unzip it).

With the step-by-step guide above, you have the roadmap. OpenEmu handles the heavy lifting of core emulation, controller mapping, and library management, while this guide equips you to solve the unique challenges of arcade ROMs.

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