There is only one file type that uses the .NOZZLELIBRARY extension:
Painter Nozzle Library
Collection of nozzles created and used by Corel Painter, a drawing application used to create digital artwork; includes Gravel, Dirt, Kaleidoscope, and Tree effects.
A nozzle is similar to a Photoshop brush stored in an .ABR file. It can be created, imported, and exported through Painter. You can apply a nozzle to your canvas and manipulate the graphic or image contained in the nozzle. It is similar to other Painter media such as Weaves, Looks, and Patterns.
You can access a library of nozzles through Painter's Media Library Panel. Selectand the Media Library panel will appear with tabs for Pattern, Gradient, Nozzle, Look, and Weave libraries. Here you can create, import, or export media libraries.
Updated: June 11, 2019