We recently upgraded to 12, but still need to maintain older versions of our software that we must with IVF 9. Both are built with MS VS 2005. I was previously easily able to switch between IVF 9 and 10 through the Options is VS 2005. This seems to not be possible with version 12. Is there a work around or hack that would allow me to switch between integrated fortran compilers in VS 2005?