If it is a standard MP4, it should open in VLC, Windows Media Player, or QuickTime.
Based on technical standards for files with these identifiers, Likely Contexts AR 00103b mp4
If you are trying to create an AR experience with this file, tools like Adobe Express can help ensure the MP4 is optimized for web-based AR triggers. If it is a standard MP4, it should
If you have an original .arf version of this file that won't play, you can use the Webex Recording Converter to turn it into a standard MP4. If it is a standard MP4