It's part of CD "Cocreate Electronic Manuals" that I received in 2000!
It is old but it could be useful.
In the CCUF (CoCreate User Forum) there two references about it:
https://www.cocreateusers.org/forum/archive/index.php/t-2642.html
https://www.cocreateusers.org/forum/showthread.php?t=2931&highlight=electronic+manuals
Anyway, there isn't any explanation about those unnecessary (I think) information.
Could you explain how you generate this file? What actions did you do? Did you delete geometries, points, texts or others? Did you convert from other CAD?