Thanks very much, not sure how I missed that so many times :)

@Froggy01 : I am with Notepad++ 6.8.6. So I uninstalled it and installed 6.8.3. And all is correct and I see cyrillic letters. To be sure this is a version problem, I uninstalled it and installed 6.8.6 again. And surprise I can see cyrillic letters without a problem :)

Than you for your assistance