3.1. How do I know what version of MFC I'm using?

Check the top of the MFC header file afxver_.h (lives in mfc\include\afxver_.h). Older versions use afxver.h. In there you will see a #define for _MFC_VER.

This is the hex version of the MFC release with this key:

0x0250

           |_________ Point release ( very minor)

         |__________ Minor number

      |___________ Major number

 

So in this example, the MFC release is 2.5.0.