Google Sketchup Texture File
Sketchup Texture and Material files are created by the program Sketchup which was originally developed by @Last Software which was acquired by Google in 2006.
Sketchup is a 3D Modelling program usually used in 3D Design.
Texture files used for various materials such as Vegetation, Bricks and Colours, these files use the .skm file extension
How to open .skm files?
Software to open .skm files
What are .skm files