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What happens when you try to open a D5 nef?
Have you updated photoshop to camera raw 9.5?
In photoshop cc go to Help>Updates.
The problem is not limited to Macs. I have a PC, just downloaded PS CC, LR CC, and Bridge CC. Lightroom will open the D5 NEF files, but neither of the other two applications will. Frustrating! There does not appear to be anything else I can do (already running the most up-to-date versions of all these programs).
You need to update the PS camera-raw plug-in to ACR 9.5.1. If you've just installed PS/Br, you're probably running ACR 9.1 or 9.0.
The check-for-updates process may not find updates right away if you've just installed. Use PS-or-Help / About Plug-in / Camera Raw to find out what version of the raw plug-in you have installed.
If Help / Updates doesn't find the new one by now, you can always download and run the manual installer from here: