The .pak file is likely incompatible with the core version. Try searching for a newer or older version of the game or re-downloading the core via RetroArch's Core Downloader .
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A common crash occurs when users accumulate hundreds of OpenBOR .PAK files. The engine tends to scan the directory aggressively, and when placed within the constraints of the RetroArch environment, users have reported that the application crashes if more than 10 to 15 games are in the folder. Setting up OpenBOR in RetroArch is slightly different
Setting up OpenBOR in RetroArch is slightly different from loading a standard emulator, but once you understand the file structure, it is straightforward.
: OpenBOR writes save states and configuration files to its internal directories, which can sometimes face write-permission restrictions.
Given the complexity, the most reliable way to enjoy OpenBOR games is to use the engine directly.