What is a .MCA file?
MCA is a Minecraft Anvil region file, storing a 32x32 chunk area of a world.
- Did you know
- Minecraft splits its endless worlds into MCA region files on disk.
- Each MCA region holds a 32x32 grid of chunks - 1,024 in all - prefixed by tables of their offsets and last-saved timestamps.
- Chunk data inside is stored in Minecraft’s NBT (Named Binary Tag) tree format, compressed with GZip or Zlib.
- What Analyser reads
- Identify and read more game and emulator files: Unity asset bundles, Unreal cooked assets, CISO/CHD disc images, FMOD/Wwise sound banks, Spine skeletons and atlases, GameMaker/LDtk/TIC-80 projects, Minecraft Anvil regions, Warcraft III maps, Ren Py and RPG Maker data, extra console ROMs (Atari, PC Engine, Master System/Game Gear, WonderSwan, 3DS homebrew), xdelta/Basis patches and emulator saves and movies.
- Depth of analysis
- .MCA is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .MCA file
- Drag a .MCA file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.