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Unfortunately, I'm not at my computer, I'm a PC guy, and I don't have a version of PS that old installed on any of my computers, but a couple of possibilities did occur to me:

I could be wrong, but if memory serves, CS5 came out roughly around the same time as the d300s.  You should check to see if CS5 actually supports NEF files from the 300s.   If it doesn't, you can run the NEFs from that camera through Adobe's free DNG converter program and have it output 16 bpc TIFFs which will be able to be read by older versions of PS.

The other possibility that occurred to me is that Lightroom, and other programs like Aperture, and possibly Bridge have an option to treat JPG / NEF pairs as a single file, not as two distinct files, e.g., http://www.lifeafterphotoshop.com/lightroom-raw-plus-jpeg-pairs/ .  There may be a similar option somewhere in CS5 Bridge.  I'm pretty sure that a couple of the other guys on this forum still have a working copy of CS5 installed, so maybe they could check out some of these possibilites.

HTH,

Tom M

PS - I presume you have only recently tried the combination of d300s NEFs with CS5 ... ie, it's not that you've done this successfully in the past and it stopped working recently, eh?