Minecraft wiki entry for Creating_a_resource_pack, associated text: To create this file, we need to create a text file within the folder and name it pack.mcmeta. Make sure the file extension is .mcmeta and not .txt or the pack may not be detected. When renaming you may get a warning that changing a file name extension could make the file unusable or may switch the program required to open it. You can still open this file in a text editor by right-clicking the file and selecting the "Open With" option. Note: You may need to select a program using your file browser.