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: Because this specific naming convention is often used for files shared in messaging groups, always ensure you trust the source before downloading or opening the video to avoid potential security risks.

: The file extension indicating it is an MPEG-4 Part 14 digital container, the most widely used video format due to its compatibility with almost all devices and platforms. What is an MP4 File?

: It uses efficient codecs (like H.264) to provide high video quality while keeping file sizes small, which is ideal for sharing over mobile networks or social media.

Video File "type" Naming Convention Within Folders - Microsoft Q&A