: Place your .pak game files into the Paks subfolder within the same directory as the .pbp file. Run in RetroArch :

On Windows, OpenBOR is often better used as a rather than a core. You can simply download the official OpenBOR engine , place your .pak files in the Paks folder, and run the .exe directly. Tutorial: How to play OPENBOR in Retroarch - Lakka

: Ensure your .pak files are named correctly and placed in a folder named exactly Paks (case-sensitive).