02-13-2010 03:34 AM
For people who are having difficulty opening non-DRM PDB files on nook, there may a a possible fix as stated by user =X= over at mobileread forums. This is what he has stated and it has been confirmed by others:
Also make sure when you are creating the PDB book in calibre you are selecting the "eReader" option.
02-13-2010 12:15 PM
The problem is usually not with the file names. Calibre also did not originally open these books. When John at Calibre fixed this problem he mentioned that the books were in an older format (202 byte headers),
Reformatting them with Calibre should of course fix them as it will produce books in a newer format.