Opening a file with a faked extension can trigger a script or install a virus on your system.

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The file ends in .mkv.mp4 . Real video files use a single extension (like .mp4 or .mkv ). This technique is often used to hide the true nature of a file; for example, a file named video.mp4.exe is actually an executable program that can install malware.

The name is designed to grab attention using explicit keywords. This is a classic tactic used by "adware" or "malware" distributors to trick users into clicking.