Bad colors in CMYK file

[mentat]

Hello.

I have some CMYK files, but i read it in xnview, I have wrong colors (green -> fluo green for example).
If I load the same file in Gimp, I haven't the problem.
Do you an idea about this problem ?

Thanks in advance

[xnview]

Could you try to activate option/General>ICC

[mentat]

Hello.

Option activated and problem killed !

You're the boss.

Happy new year and thanks for your answer !

PS: Could you explain in a few words what is this option and differences between the two modes ?