Insomnia Mac

[Your Computer]

The .bat file is irrelevant on a Mac (unless you're running Windows in a virtual machine). You need to extract the contents of the archive where Amnesia is installed in: redist folder for retail edition, amnesia the dark descent folder for Steam edition. Then you need to launch the game with the same parameters (i.e. the path to the .cfg file) as shown in the .bat file. This means opening up a terminal (console) and manually typing it in.