Have found the answer
The first two bytes refer a polygon's type & subtype and the last two to
the location of the polygon data block as an offset.
oops
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Each polygon has a separate generally 4 byte block referred to at 0x47 of a
non NT type file header;
the first two bytes plainly tells me where the polygon block is found,but what
do the other 2 bytes refer to?
They are obviously incremental for each polygon and may be related to a
polygon’s xp
