What is .MSK file extension?
Layer mask created by Paint Shop Pro (PSP), an image-editing program; stores the height, width, resolution, and the mask, which is stored as a grayscale image; used to cover parts of an image, or to create fading effects.
MSK files store shades of gray that define the varying degrees of the image mask. Where the mask is black, the underlying image is not visible. Masks can be built in Paint Shop Pro using preset shapes and sizes.
NOTE: PaintShop Photo Pro, the successor to Paint Shop Pro, does not support MSK files.
You can see a list of software programs here on easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.