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when I double click Mainwindow.xib file the Interface Builder does not open. I did some research but I could not solve it, I encounter with the same question on many websites but there is no solution.
I do not know the application type is important or not, I mean I have created iPhone Window-Based, iPhone Navigation-Based but the Interface Builder did not open.
Another thing is I use MonoTouch trial version, I do not know if it might be the reason for this. What can I do to solve it? Thanks for advance.
The issue was that interface builder (xib) was not installed. I fixed this by reinstalling everything as indicated on this page: http://monotouch.net/Documentation/Installation
But when I installed the Iphone SDK, I selected all components including the Mac API option.
Hope this helps:)
Benn