When the Eurovision finals kick off on Saturday, software nerds will have something to look forward to: a Finnish guy named “Windows95man” decked out in Microsoft gear, belting out a song titled “No Rules.” If you’re a typical American, Eurovision seems like a fever dream. It’s a bunch of largely European countries sending singers and artists to compete in a sort of Euro World Cup of odd, artsy performances. Will Farrell’s Netflix hit Eurovision Song Contest: The Story of Fire Saga nailed the vibe, and Windows95man’s No Rules feels very much in the spirit of it — the guy emerges from a giant e…