The CON format is used by Duke Nukem 3D, WW2 GI, and Nam for scripting and game parameters. They are ASCII text files containing directives in a custom scripting language. The scripting language was extended by the later games, and those extensions were re-added to Duke3D by the EDuke project. EDuke has been superseded by EDuke32 which has its own wiki documenting the enhanced CON language. The subset of commands available in the original Duke Nukem 3D are also listed.