.DAT_MCR File Extension
File TypeMinecraft Level.dat Backup File
This file is saved in a binary format, which requires a specific program to read its contents.
What is a DAT_MCR file?
File created by Minecraft, an open-ended 3D construction game; saves a backup of the level.dat file when the newer version of the game updates from the older "Region" (.MCR) format to the newer "Anvil" (.MCA) format.
The level.dat_mcr file can be restored to the level.dat file if you want to revert to the older world format.
NOTE: Minecraft Snapshot 12w07b was the first version to update to the Anvil world format.
level.dat_mcr - A backup of the level.dat file created when newer versions of Minecraft update to the "Anvil" format. It is created so the user can revert to the older MCR format if desired.