Autohotkey script for alt+F4

I need a way to create a shortcut icon on the Desktop that when clicked, emulates the press of ALT+F4. I was thinking at AutoHotKey, I have bound the alt+f4 combination to F12, but then I can't manage to send the keystroke automatically. I want that when I run the script, it emulates Alt+F4 and then close itself. I don't know if there is a better way, I'm open to any solution

Thanks

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