An nsk file extension is associated with the NaShrink software and used for its compressed archives. Probably obsolete.
NSK file extension - NaShrinK compressed archive
What is nsk file? How to open nsk files?
File type specification:
The nsk file extension is related to the NaShrink, a data compression software. The nsk file contains compressed archive.
Most likely some old format without support. No further information could be found.
This nsk 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.