title: Environment Variable to determine the OS type (Windows XP, Windows 7)
body: <p>I want to differentiate between Windows XP and Windows 7 in a XML file. Thought i will use an environment variable for it inside the XML. </p>
  
  <p>However I could not find any system environment variable defined in windows that gives this information. </p>
  
  <p>I see the %OSTYPE% variable but it is only available in Windows 7. It is not defined in XP. </p>
  
  <p>Is there anyway i could do this?</p>
  
  <p>Note that i would like a solution which purely depends on system environment variables. I do not want to create new variables based on executing some command, because i want to use this variable in a XML file.</p>