I am also currentlyusing Elements 10 and have recent'y purchase a Nikon D810. I can load NEF files fine from my previous D90 but unable to lad NEF files from the D810 as Adobe says "wrong file type" Any suggestions please?
Please refer to
The answer is Elements 10 supports only up to Camera Raw 6.7.
The Nikon D810 is not supported by Camera Raw until Camera Raw 8.6 which is supported by at least Elements 12.
The Nikon D90 is supported by Camera Raw 4.6, 5.1.
All of that is consistent with your observation on what works and what does not.
Your solutions include
a. Move to about Elements 12 which supports Camera Raw 8.6
b. Use the DNG Converter