Macintosh users just have to wait a bit after the release of a new camera. In OS X, raw file support is something that's part of the OS and Apple themselves regularly update that file. (Plus the Apple apps such as Aperture, iPhoto, iMovie, Photos, and Final Cut Pro X use this). Unfortunately, Apple isn't particularly fast at producing these changes, but they do support the full line of Nikon cameras. Update: note that only the current release of macOS is updated, not previous ones. So, at the time of this updated message, only macOS High Sierra gets these important camera definition updates.
Windows is a different story, as the OS itself doesn't include raw file support. Third party Codecs exist and seem to have no problem keeping up with new cameras and new OS changes, though. For instance, FastPictureViewer supports the latest 64-bit versions of Windows (Vista, 7, 8, etc.) while Nikon still hasn't gotten around to it after several years. Another option is Ardfry, which is a newer company providing Windows codecs. Both these Windows options require a small payment for the codec, though.
Eventually, Microsoft or Nikon gets around to releasing raw codecs for Windows Vista, 7, and 8, but, like Apple, this sometimes happens long after the release of a camera, leaving a time gap where the OS doesn't handle raw files with previews.
