I can provide more targeted safety advice based on your situation. File checker: Scan files for viruses - NordVPN

The "file" may actually be a malicious program ( .exe or .scr ) designed to install hidden software.

To protect your devices from threats like SmilyMP4, adopt the following cybersecurity practices:

"SmilyMP4" should be treated with high suspicion. It is rarely a legitimate video file and is more commonly associated with malicious downloads. Users should rely on official, reputable services for their media content to avoid infection. To help you further with this topic, please let me know:

In many scenarios, particularly when encountered on unfamiliar websites, a "SmilyMP4" file is not a conventional video file but a disguised threat.