An nu6 file extension is related to some applications developed by Symantec. An nu6 file stores system dll library.
NU6 file extension - Norton Utility system dll library
What is nu6 file? How to open nu6 files?
File type specification:
The nu6 file extension is associated with Norton applications, that are developed by the Symantec.
Most likely some old format without support from developer. No further information could be found.
This nu6 file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.