i dont know if it is up to you or maybe there already
is someone who has improved the firmware for the yepp
device, but as i have seen there are some files on the
card which are not seen on the windows version of yepp
explorer, those include:
config.dat
serial.dat
encode.mas
decode.mas
the ones which are particularly interesting could be
encode and decode mas which probably include the
decoding firmware - once changed/improved yepp maybe
will play wma, realaudio etc :D