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The r2000 format (used for r13-r2000) knows the following 6 sections:
HEADER CLASSES HANDLES OBJFREESPACE + 2NDHEADER MEASUREMENT/TEMPLATE AUXHEADER (only r2000)
The r2004 and r2007 format (used for r2004-r2018) knows the following sections:
R2004_Header UNKNOWN SUMMARYINFO PREVIEW VBAPROJECT APPINFO APPINFOHISTORY FILEDEPLIST ACDS REVHISTORY SECURITY OBJECTS OBJFREESPACE TEMPLATE HANDLES CLASSES AUXHEADER HEADER SIGNATURE INFO SYSTEM_MAP
The old pre-R13 formats (from r1.1 to r11) have those sections, with the tables interleaved into the HEADER.
HEADER ENTITIES BLOCKS entities EXTRAS entities
With (from r1.1 to r10) those 5 Tables:
BLOCKS LAYER STYLE LTYPE VIEW
With r11 came the additional tables:
UCS VPORT APPID DIMSTYLE VX
But we convert them internally to r2004 table record and table control objects. See Tables.