[..] You've been able to write software for Windows that allows for non-admin since 1999. My Documents, no user files in Program Files, non-admin logins, the whole nine yards.

But, of course, developers are lazy. They don't want to write proper software.

Can Microsoft force it? Of course. They tried it with Vista and UAC; pop up a little 'fuck you' every time a program does something [in] the Windows 95 paradigm. And they got raked over the coals for it.