title: DWORD and DWORD_PTR on 64 bit machine
body: <p>There are few <code>*_PTR</code> types added to the Windows API in order to support Win64's 64bit addressing.</p>
  
  <pre><code>SetItemData(int nIndex,DWORD_PTR dwItemData)
  </code></pre>
  
  <p>This API works for both 64 and 32 bit machines when I pass second parameter as <code>DWORD</code>.</p>
  
  <p>I want to know, if this particular API will fail on 64 bit machine, if I pass the second parameter as <code>DWORD</code>. How can I test the fail scenario?</p>
  
  <p>Thanks,
  Nikhil</p>