From the same author who brought us AutoRunSettings, come ListDosDevices. It ISN'T a Commandline application, but it does show a CMD window. I haven't added because applications that I have added in the past that show the CMD window, have received a negative response.
Download:http://www.uwe-sieber.de/drivetools_e.h ... DosDevicesDrive letters are references to kernel objects thru 'symbolic links'. For historical reasons they are sometimes called 'DOS device names'.
ListDosDevices shows which 'symbolic link' is behind each drive letter.
Edit: Spelling mistake.