In Windows 7, how do I make Sound Scheme changes for all users?

In Windows 7, how do I make Sound Scheme changes for all users?

On a Windows 7 machine, I would like to make changes to a Sound Scheme and
have them affect all users on that machine.
I've found that if I log in as a user without administrative privileges, I
can make changes to which sounds play on which events that persist for
that user across logon sessions on that machine. However, those changes do
not apply to other users on the same machine.
If I log on as a user with administrative privileges, what would I do to
make a change that will apply, by default at least, to all users on the
machine?