It looks like that both the .nkx to and .nicnt files are used in various audio production software from NI, so perhaps some kind of nkx to nicnt conversion is doable. But according to the web, a tool called inNKX could be used for this purpose. It is actually a plugin for Total Commander and it designed to repack various NI files. Unfortunately, it's a bit of challenge to find a source from where you can download the inNKX plugin.
Updated: July 31, 2023