ADT/v18
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Retrived from; http://wowdev.org/wiki/index.php/ADT
ADT Files
ADT files contain terrain and object information for map tiles. They have a chunked structure just like the WDT files.
A map tile is split up into 16x16 = 256 map chunks. (not the same as file chunks, although each map chunk will have its own file chunk :) ) So there will be a few initial data chunks to specify textures, objects, models, etc. followed by 256 MCNK (mapchunk) chunks :) Each MCNK chunk has a small header of its own, and additional chunks within its data block, following the same id-size-data format.