2119702874761.mp4 -

: If the default player fails, the VLC media player is a highly recommended free tool that supports nearly all video formats.

For a quick guide on how to create and open these files on your computer, check out this tutorial: How to Create and Open an MP4 File YouTube• Nov 2, 2016 2119702874761.mp4

Are you trying to within a game folder or convert it to a different format? How to Create and Open an MP4 File : If the default player fails, the VLC