: If you didn't specifically choose to download a 240p video, delete the file immediately . Opening unknown .mp4 files can occasionally trigger scripts that exploit media player vulnerabilities.
: This is the file container. While MP4 is a standard video format, generic files with this name are frequently used to hide adware or malware . Why did this happen? Download (1) 240p mp4
: If you were trying to save a video from a social media site using a browser extension, the extension may have failed to fetch the high-quality version and defaulted to a generic 240p "placeholder." : If you didn't specifically choose to download