: Open the file with a fully updated, sandboxed player like the latest version of VLC or your browser’s built-in player.

: Use an online scanner like VirusTotal to check the file against dozens of antivirus engines before opening.

: This indicates a standard MPEG-4 digital multimedia container, widely compatible with almost all modern devices and players. Safety & Security Assessment

: Ensure "Show file extensions" is enabled in your OS to confirm it doesn't end in .exe , .scr , or .bat .