Minecraft wiki entry for NBTExplorer, associated text: NBTExplorer is a low-level graphical NBT (Named Binary Tag) data editor for Minecraft. With a directory-tree interface for easily exploring multiple worlds, and support for the latest NBT standard, NBTExplorer is built on top of Substrate. Almost all things in a map in any Minecraft version is built with NBT, so you can usually change the datas for the newest version without updating NBTExplorer.