This looks like a GUID format ( 3D90B956-3AF4-4D8D-A424-FEACAC9D0CA3 ) followed by a file extension ( .MP4 ) and an additional hash identifier ( .329d3b ).
If you can provide the where you found this string (e.g., a specific website URL, a software console log, or a shared file link), I can try to identify what type of video it refers to. 3D90B956-3AF4-4D8D-A424-FEACAC9D0CA3.MP4.329d3b...
These types of names are often generated automatically by web applications, cloud storage platforms, video encoding services, or content management systems to ensure no two files have the same name. a specific website URL