Thank you for your help.
I've successfully extracted the files from the disk image. Of course it won't run, but i only want to decompile the game binary with the game data.
Interestingly, the files are again packed differently on ECS:
- Atari ST: all files RNC1 and the intro RNC2 (no mod/instruments)
- Amiga OCS/ECS: 50% RNC1, 50% RNC2 (contains mod/instruments)
- Amiga CD32: some sparse RNC1 files but almost everything unpacked
I've added the ST version to my viewer, I'm now trying to do it with the Amiga ECS. I love this one: more colors with a nice gloomy palette <3