MS-DOS autocomplete in Microsoft Windows 2000 and above

1. Open the Microsoft Windows registry editor by clicking Start /
   Run / type Regedit and click ok.
2. In the Microsoft Windows registry editor open the below folders.

   HKEY_LOCAL_MACHINE
   Software
   Microsoft
   Command Processor

3. In the command processor open the below two registry keys and
   change their value to 9.

   CompletionChar
   PathCompleteChar

4. Once the above steps have been completed close out of the
   registry editor and open the command window by typing cmd
   in the Start / Run window. To use the auto complete feature press
   the tab key any type you wish to complete a directory. For
   example, if the directory you are currently in contains the
   "Program files" directory you could type "cd
   pr" and press tab, to have the auto completion option 
   automatically type "cd "program files"".