Primitive plains will not remember a certain set of textures!

[Your Computer]

When the game first came out, custom story support didn't exist. But adding that line to the original resources.cfg would be a mistake for purposes other than custom story development. The game today, with custom story support, will load all the custom story assets for the custom story started by the user. If you add that line, you run the risk of two custom stories conflicting with each other with assets that have the same name.