XnView Software

This is pity.
I found a workaround - I start XnView with a different user account (main account for main monitor and second account for second monitor).
But unfortunately I cannot see which user account started the program.
Do you have an idea whether XnView itself or the operating system has to be ...

Why do you want to convert jpeg or tiff to raw? The quality won't become better by doing that.
PSE and LR can handle jpeg and tiff.

Unfortunately the documentation about using ICC profiles is very small - at least I have problems to understand it and solve my problem.

I used the embedded ICC profile for viewing and I think that it worked till now well.
Now I have a second monitor and now my problems start.
Is it really not ...