Alternatively you can change the setting in the Registry database:

To turn off numerical sorting:

In [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]

Set NoStrCmpLogical to 1 - that is:  "NoStrCmpLogical"=dword:00000001 

If you haven't got the Dword " NoStrCmpLogical" you can create it and set it to 1