Hi: When you formatted the card, did you do it with the Book Port itself? If not, go back and try that. The format command is the 4 corner keys (1,3, d and f), pressed at the same time. -----Original Message----- From: bookport-bounce@xxxxxxxxxxxxx [mailto:bookport-bounce@xxxxxxxxxxxxx] On Behalf Of Donald L. Roberts Sent: Wednesday, August 05, 2009 10:42 AM To: bookport@xxxxxxxxxxxxx Subject: [bookport] Playing unfiltered files not supported I bought a new 4 gig CF card and formatted it as Fat 32, after which I copied a number of mp3 files on to the card without using the bookport file transfer utility. I thought that because these were mp3 files, it would not matter that I did not use the transfer utility. At any rate, when I attempted to play these in the bookport, I got the message "playing unfiltered files not supported." That may not be verbatim, but it is close. So, what is the solution to the problem? Other CF cards work fine in the Bookport, and I can play the files on the new card using other devices. Thanks for suggestions. Don Roberts