.MINE File Extension
Minecraft Classic World
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What is a MINE file?
A MINE file is a game world created by an early version of Minecraft. It contains a record of the world's terrain, objects, and spawn point. MINE files cannot be opened in modern versions of Minecraft, but they can be converted to newer world formats.
Minecraft is a popular block-based construction and exploration game. In 2009, Mojang released an early online version of the game, which players could play in their web browser. Players often refer to this version (which is now largely discontinued) as Minecraft Classic.
Classic included the ability to save a player's current game world as a MINE file. This allowed players to store their saved games locally and resume them in Minecraft Classic at a later time. Some Minecraft enthusiasts still possess MINE files, and they have figured out ways to continue using the files with Minecraft Classic and convert the files to modern Minecraft world formats.
NOTE: While there is a rereleased, tenth-anniversary version of Minecraft Classic available online, that version does not allow players to create or load MINE files.
How to open a MINE file
You can load a MINE file in a player-modified version of Minecraft Classic (Web), which restores the ability to save and load MINE files. For instructions on how to do so, refer to this forum post.
You can also open a MINE file in ClassicExplorer (multiplatform) and some versions of MCEdit (Windows, Linux). Doing so will allow you to view the world your MINE file contains. You can also use MCEdit to convert your MINE file to newer Minecraft world formats, for use with newer versions of the game.