OK, I found a solution but it's weird to me that the FCam DNG files are not universally readable. I used Adobe DNG Converter (freeware) to convert the Nokia DNGs to Adobe DNGs, and the new versions are now readable by Aperture. Just back from an extended camping trip in Scotland, and it's hard to complain about the quality of the photos - given all the built-in limitations - lens quality, resolution, D Max, etc. (2 images attached)