Thanks for the reminder Gavin. I wasn't sure if Linus was talking about
extending Inventor through the file format or code, but for Out Of Box I
created a small multimedia scripting language by extending Inventor. It
was very easy. Most of my new base classes were derived from higher
level Inventor classes. Once my base classes were defined it would take
me less than 20 minutes to create a new action class. Once I had
defined a new action and linked it, it automatically just worked. I
don't know what else I can tell you. I suggest you review the Inventor
Toolmaker, it has some good examples.
Kevin