I've bought 3 books from
www.mobipocket.com - registered the PID etc. The first book opens fine and is readable.
The other 2 cannot be opened and the cybook says they are invalid (files dragged and dropped on Windows and also on a Mac, different browsers etc).
So I've installed the mobileread software on windows and the files open fine in it and work. If I then sync them to the cybook again I get the same problem.
So its looking to me like the cybook cannot cope with certain .prc format books supplied by Mobipocket.
I understand that the .prc format is generally a bit of mess so I'm guessing that these 2 books are probably in a poorly built format of it.
Any suggestions ?