When the user selects the Open dialog choice from
the File menu, either open a new window or replace the contents
of the current window.
[ ]
When the user chooses Open from the File menu, and
the contents of the window are to be replaced, prompt the user with
a message to save the window contents if possible.
Selected Menu
[ ]
When the user chooses Open from the Selected menu,
open each selected object in a separate window.
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