Let's say I have a .NET application that uses an XML file to define
various configuration settings. So that I don't have to create the
file the first time the code runs, I create a "stub" of the file and
include it in a standard Setup package. But what if I have been using
the application for a while, and I add some features to the
application so that I need to re-install it. How do I set the Setup
package to recognize that the file is already there and not overwrite
it with an empty stub?