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 Minecraft save recovery and upgrade guide
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 Important versions' dates
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Indev 0.31 20100122 -> 2010/01/22
Infdev 20100327 -> 2010/03/27
Infdev 20100624 -> 2010/06/24
Beta 1.3  -> 2011/02/22
1.2.1 -> 2012/03/01
1.18 -> 2021/11/30


------------------
 Pre-indev format
------------------

No informations about this format.


--------------
 Indev format
--------------

These maps are contained in ".mclevel" files.

MCEdit:
  All versions should support this format.

Versions:
  Indev 0.31 20100122 -> Infdev 20100325-1

Wiki:
  https://minecraft.fandom.com/wiki/Java_Edition_Indev_level_format


--------------
 Alpha format
--------------

MCEdit:
  All versions should support this format.

Versions:
  Infdev 20100327 -> Beta 1.2_02  (Excluding inf-20100624)

Wiki:
  https://minecraft.fandom.com/wiki/Java_Edition_Alpha_level_format


---------------
 Region format
---------------

MCEdit:
  MCEdit 0.15.1 works just fine.
  Newer versions don't support this format.
  MCEdit 2 And MCEdit Unified don't either.

Versions:
  Beta 1.3 -> 1.2

Upgrading:
  Any version between 1.2.1 and 1.17.1 should be able to
   handle and update or convert this format with few to
   no chunk errors.
  TODO: The external program.


Wiki:
  https://minecraft.fandom.com/wiki/Region_file_format


--------------
 Anvil format
--------------

MCEdit:
  MCEdit Unified should work just fine.
  MCEdit 2 and Amulet haven't been tested but should work.

Versions:
  1.2.1 -> 1.17.1

Upgrading:
  Any version after 1.2.1 should be able to handle and
   update or convert this format properly.

Wiki:
  https://minecraft.fandom.com/wiki/Anvil_file_format


--------------
 1.18+ format
--------------

Not enough info is available at the moment