Jim...
sorry. You made me realize that I wasn't clear.
I have been using Digital Edition v1.0 (installed during Tiger), and now am unable to add anything to it, as I am using Leopard.
I have bought an eBook from Peachpit Press which won't install in Digital Editions 1.0. Further, I tried to install the "ebx.etd" file that was downloaded, into Adobe reader 6.0, which can often read my older eBooks, but Reader 6 says the file is damaged or missing something.
So an Uninstall of DE 1.x is really what I need to do.
Thanks
peter