What does that mean? Does this come with a legit PSX ISO or something?
It's a .zip file (console .zip) with an emulated PSX version in it. In the directory of this emulated PSX version there is a folder called "game". This folder has a "Tunnel B1 (USA) .bin" (Track 01 - 15) and a "Tunnel B1 (USA) .cue" file in it.
Very interesting! I've never seen that before on GOG.
Do you know what emulator is used?