OK, well here are two screenshots from a 3790, no card. The first is with only a single Cyclops GPI on-board without any other safety cams or other custom pois of any type, the second is after the file was deleted:

Spoiler: screenshots
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If you have carefully searched the unit without the card in the unit and are satisfied there is no .gpi file hiding anywhere then [Only registered and activated users can see links. ] or [Only registered and activated users can see links. ] because perhaps the unit is 'remembering' an earlier file in it's non-volatile memory even after it was removed.