If it is a standard MP4, it should open in VLC, Windows Media Player, or QuickTime.
The "AR" prefix often refers to Advanced Recording Format (.arf) used by Cisco Webex. Since yours is an MP4 , it has likely already been converted from its original meeting format to be playable on standard devices. AR 00103b mp4
Based on technical standards for files with these identifiers, Likely Contexts If it is a standard MP4, it should
Most AR platforms recommend avoiding full-frame pure black at the start to prevent "blank" triggers. How to Manage the File If it is a standard MP4
If this is an asset intended for use in an Augmented Reality environment, it typically follows these strict requirements to ensure smooth playback: H.264 video with LC-AAC audio.