The "Resource System" is comprised of files that contain the code for loading all of the resources that Dungeon Siege and the tools in the Tool Kit need to operate, such as textures, models, and .gas files. Resources can be stored as: * Individual files on the hard drive, which we call "bits" * In a compressed, optimized meta-file called a "tank". Tank files are similar in concept to .zip files generated by WinZip™. Modifying Dungeon Siege, which includes map creation, always involves creating at least one tank file.