The only way Mif2Go can get the text content of FrameMaker system variables (such as date and time) that appear on body pages into RTF output is to convert these variables to text. Other variables are already available in a usable form, in the MIF files.
You do not need this setting for system variables that appear on master pages; Mif2Go converts those variables to their Word field equivalents. For Running H/F variables, see §18.104.22.168 .
> 5 Converting to print RTF > 5.4 Specifying document layout options for print RTF > 5.4.12 Converting system variables to text for RTF