The textures are organized into the following categories: Alpha Overlays, Everyday Color, Fabric/Leather, Glass/Transparent/Ice, Luminance, Metal, Misc., Paper/Cardboard, Patterns/Tiles, Rubber/Plastic, Stone/Concrete/Dirt and Wood. It's a .lib4d file so you can load these textures into your Cinema 4D Content Browser and easily access them at any time!