Problem in playing game in my psp

[pranav.seth]

i have a psp (i dont know the model).i have downloaded a game (gta liberty city stories).now what to do so that i can play the game in my psp (when opened, it has files like a-gtalcs, a-gtalcs.002).I also have a god of war demo in .cso format. how to play that???
Thanx in advance!

please guys help me or else my cousin will eat my brains out!!!!!! :@

guys please help me out!!!! no reply till now

[jackpot]

PM me.