Hello, I am trying to open a Project Builder in Xcode 4, but I can't get it to open. I get a alert saying that is is incompatible. With Xcode 3 I would change the .pbproj extension to .xcode and it would open, but when I change it to .xcode it still doesn't work. I also tried to change it to .xcodeproj. Anyone know how to fix it? Thanks!