disabling save-to-username default

[Nathaniel Irons]

I'm trying to write a simple shortcut to save tagged messages to a
specific file.  It looks like this:

  macro index S ";s righthere.mbox" "Save to this here mailbox"

and doesn't work, because mutt prepends the selected message's
author's username to the save path.  I'd appreciate suggestions for
overriding this username default for the macro, or disabling it
altogether.

Thanks.

  -nat