ATL_VER
Use the ATL_VER macro to specify the version of the Active Template Library (ATL) to use in the build process. This macro must be used with USE_ATL or with USE_STATIC_ATL.
Note Starting with the Windows Driver Kit (WDK) for Windows 7, all build environments support an ATL version of 7.1 (ATL_VER=71). Earlier ATL versions are not supported.
See Also
Send comments about this topic to Microsoft
Build date: 5/3/2011