: Use a tool like MediaInfo to look at the file's metadata. This might reveal the camera brand or software that created the video.
: If this file was downloaded from a website or received via email, verify the sender. Specific codes like this are often used by automated systems (e.g., CCTV exports or dashcams). Ajb08639 mp4
: If your standard video player won't open it, try VLC Media Player . It can play almost any MP4 regardless of the specific codec used. : Use a tool like MediaInfo to look at the file's metadata
