Strangely enough, I missed that part on my first reading...jakob.singer wrote:I just checked my camera settings and they are on sRGB (whatever that exactly means) and JPEGs from this camera are shown correct by XnView.
You can set sRGB or AdobeRGB with a digital camera and that setting will apply to JPEGs. For RAW files (like your NEF), colors are not stored in sRGB (nor in AdobeRGB) but in reference to the camera profile.
I don't know how XnView handle this. In particular: I am not sure that the camera color profile is actually available in the file, as it could be technically possible for Nikon to manage this in its RAW converter only...
(it would also mean that XnView would need color profiles for all cameras in such situation)