The SKM - SketchUp Materials File is a textures file originally used by SketchUp. This textures file is a drawing program developed by Google after they Acquired SketchUp in 2006. The SKM file is saved in a compressed .ZIP format maximizing capacity while minimizing space requirements. The SKM contains XML texture property files, a thumbnail, PNG image, and a JPG texture image. This file has the capacity to store and manage two-dimensional graphics that can be layered on three-dimensional models. SKM files were developed to be interchangeable on Windows and Mac OS X operating systems. The materials that are stored in SKM files can easily be accessed from the Materials pane in the software.