Thanks but I've just fixed the game by following this :
install th pkg 1st..
then go multiman file manager, inside hdd0_dev you will see some folder called <G>,<GAMES>,<game>
enter the folder <game>, naruto for example, you will see BLES00952,click into its usrdir you will see eboot.bin
now go to your naruto game file that you downloaded, copy the usrdir WITHOUT THE EBOOT.BIN and paste it to the folder <game/bles00952/usrdir>
then go back to your xmb and start the game through the pkg you installed..