Retroarch Openbor Core Portable
You cannot just download OpenBOR games from the Steam Store. You need PAK files from the community.
Best Sources:
OpenBOR is not as polished as a SNES core. Here is how to fix the big three issues. retroarch openbor core portable
Place the RetroArch binary/executable in /retroarch/ and put the OpenBOR core (libretro .dll/.so/.dylib) in /retroarch/cores/.
Copy OpenBOR Paks (pak files or folders) into /retroarch/paks/.
Edit retroarch.cfg to set:
Launch RetroArch from the removable drive, load the OpenBOR core, then load content (select the pak).
Map controls and set input/save options; save a config to the portable config folder.