Looking through the folder they appeear to be Amiga mods converted to MP3 format, I believe these were all mods created originally by Demo scene groups and the like. I listened to quite a few most of which very heavy Techno kind of stuff, 7 are listed as UNKNOWN Artist but all the rest are credit to various Artist some examples are: Amiglords/Anarchy/Scoopex/Reflex of Rebels etc. The only thing I personally recognized at all was the cool sounding Batman AcidMix.mp3 which was obviously a re-mix from the game. So I don't think any of it are straight audio rips from any games but re-mixes and originally created content by Demo scene artists. Pretty cool I think.