What does it mean when `Ex` is added to a function/method name?

Question

I don\'t work with the Windows API much, but I\'ve seen it used there as well as occasionally in a codebase here at work.

Answer 1

It's usually done as a way of changing the parameters to a function in an API without breaking existing client code. Old code can continue to use the previous version, while new code can take advantage of the new features offered by the Ex version.