Shout out to that time when I was like 11 and tried to download a lil bow wow song and my sister and I were greeted with a full screen p-in-v POV amateur porn on the family computer.
Literally the first thing I do on every new computer I've used in the last 20 years or so is change the setting to show all file extensions. It's always been scummy of Microsoft to hide those details and can only be justified at all by the notion that they want to make people dependent on their icons...which is a decent business justification and a horrible moral justification.
Fun thing, the last time I used LimeWire was actually in Linux. So obviously I was immediately highly suspicious about .exe results. (Wouldn't even have been able to run them anyway. Wine was far less functional back then.)