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Ah, filetypes - the digital equivalent of a cross between a magician's sleight of hand and a librarian's dusty shelf. It's basically the digital equivalent of a mystery box: it can contain a variety of contents, but sometimes, it throws a curveball that makes your computer's "Open File" button look like it just found a long-lost treasure map. Think of it as the digital version of a "may the force be with you" tarot card reading, but instead of seers, it's your computer's operating system.
Example sentence: "When you try to open that 'Excel Workbook' filetype, it decides it's a secret society meeting for spreadsheets and throws a tantrum, saying, 'File type unknown! Let's just... erase the chaos!'"