Chunked file structure - cmangos/issues GitHub Wiki
WDT Files, ADT Files, WMO Files and WDL Files follow a chunked structure, consisting of chunks of the following format:
Offset Type Description
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00h char[4] Chunk identifier - in reverse character order
04h uint32 Chunk size
08h size*bytes Chunk data
The initial chunk in all of these files is an MVER chunk, specifying the version of the files in a 32-bit integer. All files use little-endian byte order.