If this is a file you found, it is an video file. To see what it is, you would typically need to: Open it with a media player like VLC or QuickTime.
: If you downloaded it, look at your browser history or the website where you found it to see the original title. 23452mp4
Could you share or what kind of content you expect it to be? Knowing if it came from a specific app or website would help me track down the details for you. If this is a file you found, it is an video file
: Right-click the file (on Windows) or Cmd+I (on Mac) to see the metadata, which might list the "Title" or "Author." 23452mp4