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.

: You shared or transferred a trimmed clip from an iPhone to a PC or Mac. trim.464AFC88-EF03-4736-B7F1-CB89A7D1E88B.MOV

: This is a QuickTime file format. On iPhones, these are typically encoded using H.264 or HEVC (H.265) , which provide high quality at smaller file sizes. Why you might be seeing it : The long sequence (464AFC88

: Use VLC Media Player or the default Photos app. If it won't play, you may need the "HEVC Video Extensions" from the Microsoft Store. trim.464AFC88-EF03-4736-B7F1-CB89A7D1E88B.MOV