"fgoptional4kvideos3bin top" appears to be a specific technical identifier or a specialized file path used within the FineGrain (FG)
When you have hundreds of 4K clips, bin organization becomes critical: fgoptional4kvideos3bin top
Need help decoding another obscure keyword? Contact your system administrator or post the string in context on technical forums like Stack Overflow — include the environment where you found it. Naming: