There is an install.exe but it does the same thing! 😒

Dispite searching for and doing the solutions I've seen around here I still can't get Command & Conquer to work. I've tried mounting my CDrom drive with "mount D D:\ -t cdrom -usecd 0 -aspi", I've tried making it a ISO, I've tried everything and all I get when I type "Setup" is: Illegal Command: win …