If you have already downloaded it, do not double-click it.
Attackers frequently change the file icon to match the fake extension (e.g., a video or PDF icon), making the file look like a benign highlight reel when it is actually an executable script or malware. FIFA World Cup Highlights.mp4.mp4
Enable "Show file extensions" in your operating system's settings to see the full, true name of every file. If you have already downloaded it, do not double-click it
Clicking to "play" this video could instead trigger the installation of ransomware, spyware, or other harmful software. How to Protect Yourself If you have already downloaded it