[Ken Maltby]

.rtf files work fine on the JBL, for the most part, I haven't tested all the features
available from the format, yet. Certainly ones like color won't work on the B&W
display.

The "symbol" or icon that you see in your file explorer is of the program that you
have associated with the extension of the file. For instance your music and video
files are associated with a player program and you will see the player's icon in front
of those files. Your "mobi" player probably associates a number of different file
extensions, for "ebooks" with its icon.

Check if the file extension (the three or four characters after the period in the
file name) is one of those listed for the JBL.

Luck;
Ken