how to open pdo on mac?

It would be "inclusive", if model makers would offer .PDF versions of their .PDO models. You will lose the instructional aspect. A few designers have told me they worry people will say their models aren't buildable because they won't have the inherit instructions that come with .PDO files. This is a genuine concern. I think that .PDO's are established enough that Apple should offer a solution. I wonder if any Mac users have voiced this concern with Apple? It's kind of ridiculous. If Adobe Photoshop can run on Mac's, I am sure it would not be hard for someone to come up with a solution. Tamasoft does not seem to have the motivation or care. It seems to me the ball is in both Apple's court, and Tamasoft's too, their both at fault.