If anything can open those files for viewing, it will be NikonViewNX-i, which is available for free here:
https://www.nikonusa.com/en/nikon-products/product/imaging-software/viewnx_i/viewnx-i.html
If anything can open those files for viewing, it will be NikonViewNX-i, which is available for free here:
https://www.nikonusa.com/en/nikon-products/product/imaging-software/viewnx_i/viewnx-i.html
That’s why I always try to be kind to newbie photographers and also give them links for more and deeper information.