Let me clarify that part... What I meant was an unrecognized executable which has no reputation tracks, never been heard by most people, and you got it from a strange website. True, many executables like that are not malicious. But there are malicious examples as well. To put that in the context, I used that kind of executable in my posts above. It's unknown, but it's also truly malicious. Not an assumption, but the fact that it's corrupting Windows system files after the user executed it.