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 (or 10, or 11...) files as FrameMaker 7 MIF:
; UseFramexMIF = Yes (default), or No (to get Frame 7 MIF),
; where x is 9, 10, 11, or a later version number.
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 or a later version.