title: What does "Ex" stand for in Windows API function names?
body: <p><strong>In windows APIs and various other libraries where I have seen multiple entry points to methods I have noticed the use of the Ex abbreviation in scenarios such as MyApiCall and MyApiCallEx.</strong></p>
  
  <p>My assumption is that this stands for Extension or Extra could someone please confirm?</p>
  
  <p>Any history on why Ex was chosen rather then MyApiCall2 or similar would also be appreciated.</p>