To play an mp4 file, you need the MPEG-4 codec, which is a small piece of software that allows your computer to recognize the mp4 files and play them properly regardless of the player that you choose to use. It takes a few minutes to install the software.Continue Reading
Double-click on the mp4 file, and let your PC use a default application to open the file. If no program opens the mp4 file, then you likely don't have an application installed that can view or edit MP4 files.
Visit www.free-codecs.com, and download the XP Codec Pack. This collection of popular codecs works in Windows 8, Windows 7, Windows Vista and Windows XP and plays mp4 files.
Install the MPEG-4 codec on your computer.