I am not 100% sure, but I think that there is a registry key called Program Files Directory. The value of this key is usually C:\Program Files, but it could differ with a custom windows installation. In App Builder, when you see Program Files Directory in the selection for default directory, the App Builder looks up the registry key value and uses this directory. If you develop the app on one computer and install on another, and both computers have different values for Program Files Directory, you will see the installation go into a different directory. Did you run the installer to verify that it goes into the wrong directory? I've used App Builder in both LV 6.1 and LV 7.0 and have not had this problem.