: Most modern operating systems can play MP4 files natively using applications like Windows Media Player or QuickTime Player .

Can you provide more about where this file came from or what it is supposed to contain? How to play MP4 files in Windows - Microsoft Support

It is likely that is a private, unique, or randomly named file, such as a recording from a personal device, a security camera clip, or a file downloaded from a specific hosting service that generates alphanumeric strings for filenames. General Information on MP4 Files

: If you need to change the format, tools like CloudConvert or FreeConvert allow you to convert MP4s to other formats or vice versa.

: If the file won't open, the VLC Media Player is a highly recommended free tool that supports almost all video codecs.