Thanks ED ! You are my hero !
Never touched this settings in windows in my life !
I'm just wondering why i've dicovered this that late !
I rarely use alt+shift+anything, and when, only in reaper, and there only for one or two shortcuts and some rarely used mouse modifiers.
Really thought i was dumb when i searched for an action in the list which i just assigned to ctrl+alt+L and the search filter couldn't find it any more.
Thank you very much for the quick solution !