: The "3M" prefix often refers to "3D Multiview" (MV-HEVC), a codec extension used by devices like the Apple Vision Pro and iPhone 15 Pro to capture spatial video.
To view the contents of this file, you will need two types of software: 3MHEVC.7z
: Native support is standard on most recent hardware. HEVC files explained | How to open and use them - Adobe : The "3M" prefix often refers to "3D