How can I generate an iOS project (.xcodeproj) with AppleScript (without XCode)?
IOS – Generate an iOS Project (.xcodeproj) with AppleScript
applescriptiosxcode
Related Solutions
Use RCDefaultApp prefpane. You can get it from http://www.rubicode.com/Software/RCDefaultApp/
Open it, select UTIs and scroll down to com.apple.xcode.project. 
On the right you can change which filetype is associated to which application or disable the association completely.
Edit: another alternative is Magic Launch, which allows the same kind of file association overrides.
Open it, drag an Xcode project file into the pane on the left, set the Default Application on the right to the appropriate version of Xcode.
The problem is that Xcode 4.3 ignores the schema you had selected in older versions, and automatically sets it to run on device for iOS projects. Since you don't have an eligible device attached to your computer, you get this error. The fix is simple. In the toolbar, click on the menu which says iOS Device and choose one of the simulator options instead.
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Best Answer
You could create an empty iOS Xcode project once, put it somewhere on your disk, and then use an AppleScript to copy the folder (.xcodeproj is basically just a folder) to the desired destination.
(But I can't think of a single use for this...)