.MCMETA File Extension
Minecraft Java Edition Resource Pack Configuration File
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What is an MCMETA file?
An MCMETA file is a custom resource pack configuration file used by Minecraft (Java Edition). It contains either information Minecraft uses to load a resource pack and show it on the Select Resource Packs menu or information used to modify a Minecraft texture. MCMETA files are written using JSON.
Many Minecraft (Java Edition) players enjoy customizing the game. One of the ways players modify Minecraft is by replacing the game's default textures, items, sounds, music, and animations with their own.
To do this, players create custom resource packs that contain their modified game assets. In its top-level directory, each resource pack contains a pack.mcmeta file. This file specifies the resource pack's name, as well as what version of Minecraft (Java Edition) the pack is meant to be used with.
Resource packs may contain additional MCMETA files, which are used to modify how textures behave in the game. For example, an MCMETA file named stone.png.mcmeta may contain code used to animate or alter the stone.png texture. These MCMETA files are stored in resource pack sub-directories, alongside the textures they modify.
NOTE: Minecraft (Bedrock Edition) does not use resource packs that contain MCMETA files. Instead, that game uses .MCPACK files.
Common MCMETA Filenames
pack.mcmeta - A metadata file that Minecraft Java Edition uses to show a resource pack and its name in the Select Resource Packs menu.
How to open an MCMETA file
You can open and edit an MCMETA file in any text or source code editor. Source code editors, such as GitHub Atom (cross-platform) and Microsoft Visual Studio Code (cross-platform), contain tools that will help you edit the JSON-format text MCMETA files contain more efficiently.
MCMETA files cannot be loaded directly in Minecraft (Java Edition). Assuming you found your MCMETA file within a Minecraft (Java Edition) resource pack, you can place the pack in Minecraft's resourcepacks directory to make the pack available on the Select Resource Packs menu.