Usually, a .rar file is a container for movies, software, or music. But as the extraction reached 99%, his monitor flickered. The fans on his PC began to whine, spinning at a pitch he’d never heard. Then, silence. A single folder appeared on his desktop: .

At home that night, he found an email with the subject line: part1rar top. It contained nothing but a single attachment: a tiny image of a bench at dusk. He opened it and, for a moment, the shadows looked wrong. Then he blinked and the image was ordinary. He closed the file and then, almost without thinking, he copied the filename into a new text document and saved it as xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxpart1rar top.txt.

For advanced users, server environments, or those who prefer the terminal, the unrar command-line tool is the best solution.