EXPLORER [/n,] [/e,] [options] [folder]

User start..run to enter these commands or create a shortcut to explorer and them there.

/n, – Opens a new Explorer window

/e, – Opens expanded folder ie the normal two pane explorer.

/root – Selects a folder as the root of the explorer tree

For example EXPLORER /n, /e, /root, c:\ opens a two pane explorer window with C:\ as the root.