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Cleaning Files

Minecraft will generate quite a few files in your world folder when you create a world. Most of these files are not needed and by deleting them you can reduce the file size when it comes to uploading your world.

Below is a table which displays all the files that may be generated in your world folder, along with a description and whether or not the file is required.

File NameRequired?Description
YESStores global information about the world such as name and generation type.
YESContains all the region files of your world.
Individual region files using extension should not be included if the world was converted to Anvil.
DEPENDSStores map data for craftable maps — remove if you are not using custom map items
NOA backup of level.dat before the map was converted from the MCRegion world format to Anvil. This is typically seen in older maps built before Minecraft 1.2.1.
NOA backup of an older version of the level.dat file.
NOA timestamp when the level was last accessed. This is typically seen while a map is actively being used or modified by a third-party program.
orNOContains files which store the individual states of each player.
NOStores information about Villages in the world.
NOContains all the region files for The Nether () and The End ().
NOContains achievements and other statistics.
NOGenerated while a map is being edited in MCEdit.
NOTypically seen in maps that was loaded on Minecraft with mods involving chunk loaders.
NOGenerated by MCEdit or NBTEdit.
NOGenerated by Not Enough Items.
NOGenerated by Single Player Commands.