"I downloaded the file in the hope that perhaps Microsoft had released some sort of public beta. The file unzipped, and to my delight the Microsoft icon looked genuine and trustworthy. I clicked on the installer file, and to my horror in 10 seconds the attachment had wiped my entire Home folder!"
Why, yes, Microsoft often officially releases beta software on peer-to-peer file-sharing networks. Your confusion is understandable, and no one is going to accuse you of being a software pirate. Really.
Besides, I’m pretty sure you won’t be downloading any commercial software in the future…
Update: Oh, and note the clever way the story implies that this had something to do with Intego’s “concept trojan horse” scare story. Sorry, Charlie, but we’re not that stupid. An application that doesn’t do what you think it will ain’t the same thing as an application disguised as an MP3 file.