title: How to target both Win32 and x64 platforms with ONLY one set of solution/project files?
body: <p>I'm trying to migrate a multiple-project from VC++2005 to VC++2010, and I also need to port this application from Win32 to x64 platform.</p>
  
  <p>I know that a project file could contain settings for both platforms, but it requires that I have to manully change the platfrom setting for each project say if I want to build for x64. </p>
  
  <p>What I want to do is to have ONLY one set of solution/project files that could target both of these platforms, and with some kind of simple switch I can choose what platform I am building now.
  Is there such a way? Or do I have to maintain two sets of solution/projects files, one for each platform, so that if I want to build for x64, I can only open the solution file for x64, and if I want to build for Win32, I have to open the solution file for Win32?</p>