Your user files for one program are never "private" from any other program running on your computer. This is the security model of the desktop OS. It's not spec

Your user files for one program are never "private" from any other program running on your computer. This is the security model of the desktop OS. It's not specific to Windows. It may be presumptuous - offensive, even - for Microsoft to do this from a UX standpoint, but there's nothing new here. There was no breach of protocol, Microsoft wasn't abusing its privileged position. Any program on your PC could do this at any time. We shouldn't act surprised.