You will need to edit a registry setting:
- Go to menu Start->Run and enter regedit to run the Registry Editor.
- Browse to My Computer/HKEY_LOCAL_MACHINE/Software/Microsoft/Command Processor.
- Double-click on CompletionChar and assign 9 (ASCII equivalent of the TAB key) as the value.
- Click OK and close the Registry Editor.
- Now when you launch the command window cmd, you can complete paths by pressing the TAB key.