Minecraft Level.dat Backup File
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What is a DAT_MCR file?
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.
Common DAT_MCR Filenames
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.