The suffix .mp4 is a standard digital multimedia container format used for video and audio.
If you have encountered this file, keep the following in mind: DropMMS_com__476mp4
Standard video files can occasionally be used to deliver malware or "process injection" attacks if the file is corrupted or masks an executable. Always use updated antivirus software like Malwarebytes or Windows Security before opening files from unknown sources. The suffix
If you did not intentionally download this from a trusted person, it is safer to delete it. it is safer to delete it.