We have seen claims of "Friluftskartan PRIME - whole of Sweden" before. This also sounds like the previous misunderstandings and that's for some important reasons.
Friluftskartan PRIME consists of 308 separate areas. They are hard to combine into one "gmapsupp.img" file with MapSource or MapInstall and the size would be close to 8 GiB.
Even if it's possible to reduce the redundant data in overlapping areas we would end up in a file much larger than 4 GiB. I'm not aware of any Garmin GPS or software that renders IMG-files > 4 GiB.
Probably this is some areas from "Fastighetskartan Sweden" like in the trashed thread: [Only registered and activated users can see links. ]
It would however be good if you actually have some real parts of Friluftskartan PRIME. Maybe you could get a content listing of your "gmapsupp.img" file with the help of [Only registered and activated users can see links. ].
GMapTool list with the earlier claim of Friluftskartan Prime that turned out to be Fastighetskartan Pro:
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