Minecraft wiki entry for Custom_texture_packs, associated text: Once you are done editing, create a zip file of the files modified (or, in Minecraft 1.3, you can use a folder with the files too), preserving all folder hierarchy. The root folder of the zip must have the files and folders listed below, or else they will not be changed. If you find that nothing changes when you select your texture pack, make sure that the files are in the root of the zip and not one folder in.