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
: If the video has sound but no picture (or won't play at all), you may need to install a codec pack like the K-Lite Codec Pack to help your player understand the file's compression. What is an MP4? 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 For a quick guide on how to create
: Most modern operating systems like Windows and macOS will automatically open MP4 files using default apps like Windows Media Player or QuickTime. 2119702874761.mp4