how to open NEF files in PS 7.0 please

Raw support is version specific:

Camera Raw plug-in | Supported cameras

Camera Raw-compatible Adobe applications

Mylenium

You have photoshop 7 or photoshop elements 7?

Which operating system are you using?

What camera and model are the camera raw files from?

Unless the nikon nef files are from a very old camera, you can't open any camera raw files into photoshop 7.

And those old camera raw files required a pay for camera raw plugin (camera raw 1.0) from adobe that is no longer available.

There are several third party raw converters out there or you could upgrade (buy photoshop cs6 or subscribe to photoshop cc 2014)

Also , there is adobe photoshop elements and adobe lightroom, both of which are cheaper than buying photoshop cs6.

Opening NEF files in Photoshop 7 is a hopeless case, IMO

(PhS 7 is by no means bad, I'm still keeping a version alive).

You may try a Nikon program (Capture) and export from there as TIFF,

which can be handled by all PhS versions:

http://www.nikon.de/de_DE/product/software/capture-nx-d

Best regards --Gernot Hoffmann

You won't be able to open those d100 files directly into photoshop 7, so i would try G. Hoffmanns's suggestion about using Nikon Capture NX-D

Nikon Capture NX-D RAW Processing Software | Software for Nikon Digital Cameras