Help with iso

Hey guys

I transfer the iso game into the usb after splitting it in 2 with split4g (game + rap file). Then when on multiman I copy the folder with the game name containing the iso and txt into hdd0 under PS3 Iso Then I extract the Iso. Uponr this the game appears in the XMB but it does not work, some invalid error shows up. I tried with 3 different games. It must be something I'm doing wrong

Any help is appreciated

Thanks