>I distrbute an app using the setup wizard. The user doesn;t like my name for the directory where the app will be installed so he changes it. How to I get the new directory info from the setup program so my post setup executable knows where thingsd were put?

In the setup specify the %s\path syntax. You can press F1 on the field during setup to remind yourself of it, if it takes you a while to remember it (as it did me < s>).