AB

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AB File Structure

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Offset    Length   Description
------    -------   ----------------------------------------------------------------------------
+00       4         File ID. First two bytes define "AB", full ID is 0x41420900
+04       4         File size in bytes.
+08       4         Unknown ID. First two bytes define "EI", full ID is 0x45491800
+44       4         Unknown 1. First byte always defines "T", full ID is 0x54000000

Aside from these DWORDs that are always the same in every AB file, each one seems to have several distinct sections. The pattern of data changes periodically as you scroll through (AB files are very large), although I havn't counted how many unique sections I've seen.