Assuming that by the ""MAPS" button, you meant the "Folders" button, then as an
alternative to other [valid] suggestions made in this thread, you could :
open : Control Panel -> Folder Options -> "File Types" tab ...and on clicking the
"Advanced" button while on the "Folder" file-type, re-set the default for "open" from
"Open" to "Explore"
...this will result in ALL folders, when double-clicked on, will open in full
explorer-view with the folders pane visible (including My Documents).
This is how I have my PC set-up, so that you get the folder's view by default.
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Cheers, Tim Meddick, Peckham, London.