: Right-click the file and select Open with , then choose Microsoft Support's recommended players like Movies & TV or Windows Media Player .
The filename appears to be a randomly generated or system-assigned string, often found in cloud storage (like Google Drive or Dropbox ), content management systems, or as a temporary download name. nn0j4bjtd8_fSfIQyBBU0.mp4
: If the file won't play due to codec issues, the VLC Media Player is a highly recommended free tool that can open almost any MP4 variation. Understanding the Format MP4 files explained: How to open and use - Adobe : Right-click the file and select Open with
