Problem
Create an application that displays text from a file in an editable window. The user interface should have a menu to open a file and save a file, and a separate menu to Exit. If the user edits the file, the edited information should be savable. If the user edits the file and attempts to exit without saving the file, a popup message should report that the changes have not been saved, and the user should be given the option to either continue and exit, or cancel (so they can go back and save the file). Your menus should have keyboard accelerators.