Hi Douglas,
I know that some RAW files can be previewed on the Creative Cloud files area. I have CR2 files from a Canon 7D and they preview okay. What Nikon camera are the NEF files from? Is it possible to share an example? You might be able to preview files in the Camera Raw dialogue window within Photoshop if you didn't want to go through Bridge. Photoshop Touch doesn't support RAW files yet.
-Dave