.MCA File Extension
Minecraft "Anvil" Map File
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What is an MCA file?
World format used by Minecraft, a game that allows open-ended construction of worlds; replaces the older .MCR (Minecraft Region) format and includes enhancements such as an increased build height (256 up from 128), support for more block types, and more efficient file compression; also enables greater modding capabilities for the game community.
NOTE: The MCA Minecraft map format is referred to as "Anvil," an arbitrary name chosen by the Minecraft developers.