This variable is valid only for AC1006 and AC1009.
For versions between AC1.50 and AC1004 is this value number of entities in drawing.
PLINEGEN variable in pre13 DWG versions
This is a GitHub Issue
repo:libredwg
owner:LibreDWG
Title : PLINEGEN variable in pre13 DWG versions
Issue date:

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This variable is valid only for AC1006 and AC1009.
For versions between AC1.50 and AC1004 is this value number of entities in drawing.
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