I was looking to automatize defining the build specifications as well but I never did scripting of this sort before, so I'm a little lost. Basically I wanted to take care of, well, this http://zone.ni.com/reference/en-XX/help/371361K-01/lvhowto/compiler_optimizing_for_execution_speed/ (400+ VI's, Select each VI and clickety click click... NOPE). Anyway, I didn't get much further than being able to edit the tags I saw were already there. How would I, for instance, go through every source file/VI and define both of those properties (Uncheck "Use VI Property" and "Allow Debugging")?