How to query Internet Explorer version so it works for IE10 also?

How to query Internet Explorer version so it works for IE10 also?

My old code in C++ desktop application detected IE version by querying the
value in
HKLM\SOFTWARE\Microsoft\Internet Explorer\Version
registry key. This works for IE 9 and below but doesn't work for IE 10
(still returns 9).
What is the correct way to find out the IE version including IE 10 and
higher?
Thanks.