If I do Win+aoeuaoeu+enter, nothing at all happens. It just sits with a search box open showing "No results for aoeuaoeu". I can't actually see any way of getting to a browser search window from there (whether my preferred browser or not). So I must have found some way to disable that behaviour completely. Keep trying?
(FWIW yes that is the way I open my browser: win+fire+enter. Nothing bad happens if I do it too fast.)