Adding applications to an Xcode project

Hey all,
I have a small application that i need to be bundled inside my main application, just draging it to the Rescource folder in Xcode works until you build the application and then when you try to launch it:
If you have not launched the app before nothing happens
If you have launched the app before Finder comes up with a dialog saying “The application “my App” can not be opened because it is not supported on this system”

Is there a correct way to do this (my end users will not have launched the app before)

Thanks in advance