Minecraft wiki entry for Resource_Pack, associated text: A resource pack can be bundled with a world by saving it under the name resources and placing it directly in the world's folder. When playing the world, that resource pack appears as the default right above the default resource pack. A default resource pack can also be set on a server by adding a link to a .zip file download after the line resource-pack= in the server properties file. Users can still opt out of using the resource pack or choose not to download it, however.