If a file is cached or "previewed" in a browser, the temporary file often takes on a hashed name.

Before opening, run the file through a service like VirusTotal to ensure the "mp4" extension isn't hiding an executable. 4. Search for Context

Right-click the file, go to Properties (Windows) or Get Info (Mac), and check the "Origin" or "Comments" section.

Since the extension is .mp4 , it is a standard digital video container.