By default, Mif2Go converts all FrameMaker cross references into jumps for WinHelp, including interfile jumps where needed.
To make a cross reference into a pop-up instead of a jump, assign property PopOver to the hotspot character format; see §8.9.3.1 Configuring jump vs. pop-up hotspots. The span of the hotspot is determined by the character format applied to the reference string.
Disallowing cross references as pop-ups
To disallow using cross references for pop-ups:
; NoXrefPopups = No (default, allow override to popup) or yes