Dialog boxes for file handling missing in AutoCAD?

A student came by my office today and wondered if I knew how to bring back the usual dialog boxes for file handling in AutoCAD. A quick search using Google revealed the filedia command.

The solution is to execute the filedia command, enter 1 (the digit one) as the requested input, hit the enter key, and voilà, normal dialog boxes appear whenever the new, open, and saveas commands are executed.