I think EGI isn't similar to EDCW(EDCW is a joke of Mac, but very limited). EGI has more potential if its operation is decoded. Somebody could implement a system window as was done in w95 or Amiga, with only showing on the screen the icons loaded from a separate file("FILE.I"). I think Rhodri Cusack thought about it. Why did he an icon editor?
Some predetermined files(TXT, COM, etc) without that icon file could be viewed with predetermined icons stored on DOODLE.ICS or ICON.ICS. And then be launched automatically like the EGI system yet does. Then could be easy to add more types of file like Zozo had made to EXDOS.