Starting with Version 2011, when installing AutoCAD, the Autodesk Material Library is also installed. This material library is shared with other Autodesk software, as 3ds Max or Revit, and can not be modified, but allows their materials to be loaded into the current drawing, which are changed and then saved in a user library.
The Autodesk Material Library containing more than 1,000 textures is defined in a folder similar to
C:\Program Files (x86)\Common Files\Autodesk Shared\Materials\ (depending on the Windows version and language).
Under this folder, textures (images or photos) are available in three groups:
\assetlibrary_base.fbm\Textures\1\Mats: More than 1,000 images with 256 x 256 resolution
\assetlibrary_base.fbm\Textures\2\Mats: More than 1,000 images (Versions 2011/2012) and almost...