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Dear Alex, got it now. It are the applications still available on an another user. Will change that. Thanks!
Unfortunately my link doesn't work. And your tip: I couldn't find applications from my other OS over here. Still see them in the 'open with'-menu....
got it: https://mac-how-to.gadgethacks.com/how-to/remove-duplicates-customize-open-with-menu-mac-os-x-0157100/
Dear Arun, see my attached files, could you please let me know where to delete the old OS more than the normal way? (I still see the old OS...
Arun, Thanks for the reply. See attached an image. I've deleted Windows 7. Windows 7 Home is working. This is an example, Windows 7 is everywhere...
Dear, I removed an OS. but when I open a program on my Mac with right-click: the programs of this old OS stays in the menu available (doesn't...