that's a parallels setting. if you go into parallels, configure the VM, applications then you'll see the sharing features so you can turn it offProbably drive him more mad if he already dislikes osx. My mac keeps changing the defaults on files to open with a windows application (like a .html will open with notepad launching the vm). I'll change it back to be sublime installed on osx, it will stay that way for about 2 or 3 weeks and somehow get changed back to notepad. No idea if its an osx problem or parallels problem but it drives me crazy.