Command Prompt code "Attrib+S" won't work, please help!

Hi, I'm reading through my book on how to master windows xp and I'm on the Chapter that talks about personalized folders... it says in order to customize a background to your folder you type in (at the command prompt window) attrib+s c:\location of folder to make a background for the folder, but this code does not work.... I've tried and tried, but it won't work... so does anyone know how to customize the background of folders using command prompt? or am I typing in the wrong code? thanks