: Right-click the file and select Open with > Windows Media Player or Movies & TV .
: The VLC Media Player is highly recommended as it can play almost any MP4 regardless of the internal codec (like H.264 or HEVC). 2. Converting or Editing the File If the file won't play or you need to change its format: 4839mp4
: For tech-savvy users, FFmpeg is the industry standard for repairing or re-encoding MP4 files via command line. 3. Understanding the MP4 Format : Right-click the file and select Open with