Do you have a where this file is hosted, or are you trying to recover it from a specific device?
Since it is an MP4 file, it is a universal format compatible with most players like VLC Media Player or Windows Media Player. Troubleshooting the Download Download VID 20440720 084443 139 mp4
The filename appears to be an automated name generated by a mobile device or camera. The numbers typically represent the date and time the video was recorded (in this case, July 20, 2044, at 08:44:43 AM). Do you have a where this file is