Hello Claudia!
[HKEY_CURRENT_USER\Software\Classes\Notepad++_file] doesn’t exist.
Inside npp, I removed npp association with .txt, .log & .xml, then I added it again. After that, .txt and .log works but not .xml!
Then I rightclicked a .xml file, choosed “open with” and select always use npp. After that, .xml also works. I did try that before, the new thing was to remove and add association in npp first.
So the problem is solved, but there is still a lot of questions how this could happend.
Thanks for helping me.
Mats