By default, when you save as MIF directly from FrameMaker 9, you get FrameMaker 9 MIF files. You cannot get FrameMaker 8 MIF files from FrameMaker 9; however, FrameMaker 9 MIF is almost identical to FrameMaker 8 MIF. And Mif2Go can force output of FrameMaker 7 MIF files from FrameMaker 9.
To save FrameMaker 9 files as FrameMaker 7 MIF:
; UseFrame9MIF = Yes (default, for Frame 9 only),
We do not recommend this setting unless you must supply MIF files to someone using FrameMaker 7. This setting takes effect only if you are using FrameMaker version 9.