If you change the Registry key HKLM/Software/microsoft/CommandProcessor/CompletionChar from 0 to 9 (9=Ascii Code...
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for "TAB"), you can use the Path/Filename Autocompletion functionality inside of every DOSBOX by using the "TAB" Key.
e.g., Change to c:, type "W" and press the tab key to browse through all files/Directorys beginning with "W."
This works for Windows NT/2000.