it does not allow me to open the file on Mac mini
Viewing post in Muck (Mac and Linux) comments
No. it’s just a macOS problem which can be fixed by:
Type “sudo chmod -R 755 [drag Muck] in terminal. That should fix it. So to run the game you need steam app and have to add Muck to steam using add other apps option and run it through steam to use multiplayer. If it doesn’t work 1st try relaunch it a few times.