Hi Walt. Does this happen with every opf file, or is it particular to one? >>> walt@xxxxxxxxxx Tuesday, December 28, 2004 2:52:11 PM >>> I've completely uninstalled and re-installed both Book Port Transfer = and=20 Book Wizard Reader software on my PC. Every time I so much as arrow to = an=20 .opf file in the source folder on the PC from which I want to move it to = the=20 Book Port, I'm receiving the following message: Book Wizard Reader ERROR! Failed to load navigation control file. OK Both the transfer program and wizard are the most current betas downloaded= =20 from the APH site. I get this problem only on my system at work. At home, = I=20 don't see it. Both systems are running Windows XP SP 2. The BPL.log = file=20 shows nothing at all out of the ordinary. -- Walt Smith - Clearwater, FL walt@xxxxxxxxxx=20