OpenRAW

Jan, you can use either Photoshop CS or Photoshop CS2 to process your Nikon D70s raw files.

To access them with Photoshop CS and ACR 2.4, use the free DNG Converter version 3.1 to convert them to DNG. Then ACR 2.4 will open these DNG files.

ACR 3.1 will open the NEFs directly. Or you can use the above DNG route.

Although the D70s is not in the "official" list supported by version 3.1, it works in practice. I have done this myself.

It would be nice if all photoshop versions could open raw files via a universal photoshop plugin. Raw is about expanding the possibilities for photographers, not inhibiting them.

There couldn't be a universal Photoshop plugin for raw files, because the interface between Photoshop and the plugin has to evolve. PS 6 didn't even have a suitable interface. PS 7 had an interface capable of supporting the original limited ACR. PS 8 (CS) had a much better interface suitable for ACR 2.x. PS 9 (CS2) & Bridge is better still, which is why ACR 3.x has lots more capability.

Instead, the proper answer to this is to have a "common raw format", and have all versions of plugins, from now into the future, supporting that format.

After all, this isn't just a Photoshop problem. There are perhaps 15 or so Raw converters other than ACR. They are all wasting time & effort because of the proliferation of raw formats. Ditto for the vast number of viewers and image managers.

Have a look at the very first article posted to this website. It shows the problems caused by proliferation, even when the task is image viewing and management, not Raw conversion:
http://www.openraw.org/comments/?id=1