Since the current .exe-file doesn't have the icon.png's cool Icon implemented and shows up with the Standard RPG-Maker Symbol, I just used GIMP to export a quick Windows-Icon-file from the png in the Icon-folder (which is awesome since under Linux the PNG-file is much more useful for the Launcher - which is run through/with the compatibility layer there anyway until you "bake" a native Linux version of this one, too at least - there) and manually changed the Shortcut's image to the actual Game Icon that way, so it doesn't look so generic on the Desktop 😏 😜 .
Unfortunately I cannot upload it, but I think even Paint or any other simple Image Processing Program (like IrfanView, for example) should be capable of exporting an .ico - version of an image, I'd reckon.