.DAT_OLD 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_OLD file?
Backup file created by Minecraft, an open-ended 3D world construction game; saves a backup of the level.dat file, which is used for saving maps that use Minecraft's Alpha level format; used as a restore point in case the level.dat file becomes corrupted.