.GRADIENTS File Extension
What is a GRADIENTS file?
Library created by Corel Painter, an application used to create digital artwork; contains one or more gradient styles such as Light Streak, Oxidation, Stainless Steel, and Jungle Neon.
You can apply a gradient style to your brush strokes, which can be used to draw on the canvas. Gradients are similar to other Painter media such as Weaves, Looks, and Patterns.
NOTE: Painter uses the .GRADIENTLIBRARY extension more often than the GRADIENTS extension.