Permanently delete the file and empty your recycle bin.
The use of multiple extensions (e.g., .mp4.mkv.mp4 ) is a classic "masking" technique used to hide the true nature of a file. Many operating systems hide the final extension by default, leading a user to believe it is a standard video file ( .mp4 ) when it may actually be an executable or a script.
If you have already interacted with the file, run a full system scan using a reputable antivirus like Malwarebytes or Windows Defender .
This specific naming convention is frequently found on unauthorized file-sharing platforms, third-party "free" movie sites, and shady Telegram channels.
If you entered any credentials or "verified" your identity to access the file, change your passwords immediately and enable Two-Factor Authentication (2FA) .
Opening this file could trigger a script or install unwanted software on your device.
