Thanks...
but in the language / voice - files there is a info.ini with following entry for the flag. and two bmp - files are alltough in the zip- file included: flag_gbr.bmp and big_flag_gbr.bmp

flag="flag_gbr.bmp"
flag_icon="countryflag_gbr"
lang_extention_flag=""

the example is for the english voice, other countries have there landcode in the filename.