Pardon me if this is a “duh” topic, but it was new to me and so may be new to other developers too, so… The registry has changed under Windows 64 presumably starting from Windows Server 2003 64 bit and Windows XP 64 bit. As a result, there is a different view of the registry for 64 bit applications and 32 bit applications. According to the documentation: “To support the co-existence of 32-bit and 64-bit COM registration and program states, WOW64 presents 32-bit programs with an alternate view of ......