With this Tweak you can control the Auto Complete Mode.

To do this, follow the next steps:

1. Open the Registry Editor click on the Start button on your taskbar, then click on Run and type "regedit" and click on OK to start the regedit utility.
    
2. Expand HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ Explorer\AutoComplete (see picture 1).
   
   

   Picture 1

3. Create a new STRING value, or modify the existing value, named "Append Completion" and set it to "yes" to append the suggested text as you are typing or "no" to only show a drop-down list.
    
4. The modifications you made will be in effect after you restart or logout you PC.