title: Using relative path for "Start external program" in VS.NET 2010
body: <p>I've seen a few posts related to this topic but none with any conclusive answers...</p>
  
  <p>When debugging my VS.NET 2010 app, I'm trying to start an external program whose location is relative to the project path.  I've seen some indications that macros (like $(ProjectDir)) were supported in earlier versions of VS.NET, but they don't seem to work in VS.NET 2010.  Using relative path notation just gives me an error that the path is invalid.</p>
  
  <p>Has anyone run into this?  If so, how did you address?</p>
  
  <p>Thanks.</p>