You can edit any files that use the NBT file format. NOTE: Your level.dat file isn’t the only thing you can modify. Download the NBT file and you’re ready to edit this!
How to Use NBTExplorer to Modify Your Server World Once there, you can download the relevant files for your operating system and start the setup wizard.
You can find the download link for NBTExplorer here. NBTExplorer is a downloadable program available for Windows, Mac, and Linux. NBTExplorer is a powerful, easy-to-use editor that allows you to view and edit any attribute of your Minecraft world including player inventories, enabling and disabling hardcore mode, and much more! It’s used for editing any file that uses the NBT file format, which is what Minecraft uses for most of its world data.