Generate miyoogamelist.xml within each ROM subfolder based on the contained gamelist.xml using the script from the Onion OS Wiki as a starting point, specifically the more efficient script provided.
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Generate gamelist.xml files using something like Skraper UI and have them placed within each consoless subdirectory in the ROM folder
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Run the script from the ROM root directory, the script will scan every console subfolder for the gamelist.xml file and will generate a miyoogamelist.xml.
IMPORTANT
To avoid any issues with arcade systems, the script ignores the folders ARCADE, CPS1, CPS2, CPS3