Hi - no, I can see of no reason that you can't open in design mode. Except perhaps that in IP 2003, there was a button you could click to "design this form" and now there is not? I think if you open InfoPath Designer (2010) and under File / Open put in the URL of the template you wish to design, you'd be able to open in design mode, and save locally. I also think that if you go to the library settings, under Advanced Settings, there is an edit template link - have you tried that?
Hilary Stoupa
