AutoHotKey if statement not working

What is wrong with this?

if A_OSVersion = WIN_7 or A_OSVersion = WIN_XP
   {
   MsgBox, Win7 or XP
} else {
   if WinActive("ahk_exe Explorer") {
   !f::!h
   }
}

The goal is to replace Alt+F with Alt+H in Explorer when I'm running Windows 8, 8.1, or 10, and I am testing on a Windows 7 machine, so the code shouldn't run at all, but the hotkey does and the MsgBox doesn't. Do I need to reorder things for it to work? The syntax looks right to me, but I've been having a hard time with syntax for AHKscript.

Kind comments are appreciated!