.MCWORLD File Extension
File TypeMinecraft World Backup File
This file is saved in a zipped format. You can view the contents by unzipping it with a file decompression program.
What is an MCWORLD file?
Backup file created by Minecraft Launcher, (MinecraftSP.exe) a custom application launcher for Minecraft; saves the data files for a 3D game world and can be used for restoring a world to a previous state; not supported by the actual game, but sometimes used by game community members.
MCWORLD files are saved in a .ZIP format and can be expanded using a Zip decompression utility. The MCWORLD file can also be opened in Infdev, which is the third phase in Minecraft's development cycle and is only playable in single player Survival mode. You can access it by selecting "New Profile" and "Allow infdev" in Minecraft.