2009/7/22 Lars O. Grobe wrote: > DWG is the result of the fact that Autodesk does not want to use an > open, royalty free standard for their products. I agree totally... Just by looking at how the file is constructed, and how it changes from version to version, it seems quite obvious that someone made it complicated on purpose. I also think that no current project will be able to do a very good job at reading dwg files. The only reference document available (by openDWG) is pretty incomplete, probably exactly for the same reason (they also sell their DWG library). DWG format is so complicated that is seems to me actually a very bad format to work in, especially compared to some cool, flexible, nicely documented new formats available, such as step, svg or other xml-based things. But I also think it is a major issue that prevents people from even looking at open-source solutions. If you could read even older-version dwg files, even a couple of basic things, I hope it could become like an escape door out of the Autodesk jail... Yorik