: Right-click and select Open with > Windows Media Player or Movies & TV .
The alphanumeric string is a Globally Unique Identifier (GUID) or Universally Unique Identifier (UUID) . When paired with an .mp4 extension, it typically represents a raw video file generated by a system that uses non-human-readable naming conventions to ensure every file remains unique. 86380F55 F216 45F4 B30F 35529C9C3326 mp4
: MP4 files often store the original GUID inside the "Title" metadata field. On Windows, right-click Properties > Details > Remove Properties and Personal Information to wipe this if it interferes with media players. 4. Technical Breakdown Format GUID (UUID Version 4 typically) Characters 32 Hexadecimal digits (0–9, A–F) Structure 8-4-4-4-12 grouping (Total 128-bit) Uniqueness Probability of collision is near zero : Right-click and select Open with > Windows
Since the file is an MP4 container , it is highly compatible with most modern hardware and software. : MP4 files often store the original GUID
To make the file useful for libraries like Plex, you should change the GUID to a descriptive name. : Right-click the file and select Rename .