.PATTERNLIBRARY File Extension
What is a PATTERNLIBRARY file?
Pattern library created and used by Corel Painter, a drawing application used to create digital artwork; holds a collection of patterns that can be added to the canvas; includes Floral Fabric, Lace Ribbon, Chain, and Piano Keys; similar to .ABR Photoshop brushes.
The library of patterns can be accessed through Painter's Media Library Panel. Select Window → Media Library Panels → Patterns and the Media Library panel will appear with tabs for Pattern, Gradient, Nozzle, Look, and Weave libraries. You can then choose to create, import, or export a library with the "patternlibrary" extension.