ExfiTool version 11.22 seems able to extract all the file and camera information from the Nikon D850 NEF file, but does not seem able to extract any of the XMP/IPTC information.
Please read this post by Alan Clifford (https://exiftool.org/forum/index.php/topic,10067.msg52390.html#msg52390).
The nksc file contains the following fields in addition to the file and GPS information
MIMEType XMPToolkit About Version Appversion Appname XMLPackets XMLPacketsType
Iptc IptcType NineEdits Label Rating Trim
None of which return any information in a usable format.
Ah, OK. Good. You're looking at the NKSC file...
With the attached nksc.config file and the most recent version of ExifTool (11.38), you can use the following command to decode all of this:
exiftool -config nksc.config FILE
- Phil
Many thanks