Copying will not work if the drawer icon you are copying over does not have an actual drawer to open. I tested your icons and it failed for me too until I made a drawer with the same name in the directory. Then it worked fine... If this is not the problem then something is messed up in your installation.
To change the type of icons all you have to do is select the icon and select icon information from the menu - as Thomas mentioned earlier. The RAWBInfo window will open and you can then select the icons type in its menu and save the changes.