: Simply double-click it to open in QuickTime or Photos .
The filename follows a specific naming convention used by Apple’s iOS and macOS when you use the built-in "Trim" feature in the Photos app. While the file itself is unique to your device, What this file is trim.464AFC88-EF03-4736-B7F1-CB89A7D1E88B.MOV
: The long sequence (464AFC88...) is a UUID (Universally Unique Identifier). It ensures that even if you trim multiple videos, no two files will have the same name. : Simply double-click it to open in QuickTime or Photos