My experience using a new micro SD Card with my Clip Sport:
I insert the new card while the player is Off and not connected by USB.
Then I turn the player On and it automatically adds the required Folders and database files to the card.
I never observed a folder AUDIOBOOKS. I like your idea of reformatting your micro SD card (FAT32) and then let the player prepare new folders and database files required by FW 1.29.
