title: Build Issues after Upgrading app from vs2005 to vs2012
body: <p>I need my application to be upgraded from visual studio 2005 IDE to visual studio 2012 . 
  The upgradation wizard converts the solution and project files successfully with 0 errors and few warnings. </p>
  
  <p>But when i start building the application i get error message :</p>
  
  <p>error C1189: #error : This file requires _WIN32_WINNT to be #defined at least to 0x0403. Value 0x0501 or higher is recommended. in atlcore.h !</p>
  
  <p>I tried changing the version no to 0x0500 , 0x0501 , 0x0502 and also 0x0601 ( both through /D compiler option and manually changing in atlcore.h , WINVER is also changed. ) but no luck . the same error is being displayed. </p>
  
  <p>Where do i go wrong ?</p>