In bsnes' encompassing folder there are 3 subfolders: Database, Firmware and Shaders. It ignores the content of Firmware (possibly Database and Shaders too), instead you have to make a Firmware folder in the Contents of the app bundle which bsnes recognizes. There are Database and Shaders folders too, which are duplicated from bsnes' encompassing folder.
In bsnes' encompassing folder there are 3 subfolders: Database, Firmware and Shaders. It ignores the content of Firmware (possibly Database and Shaders too), instead you have to make a Firmware folder in the Contents of the app bundle which bsnes recognizes. There are Database and Shaders folders too, which are duplicated from bsnes' encompassing folder.