yaar please meri madad karo...meine ek boht hi important book download ki...kaafi heavy...wo winrar mein thi...mein usko open kar raha hoon to password mang raha hai..mgr jahan se download ki hai koi password nahi diya hua tha...meri saari mehnat zaaya chali jae gi...please koi batao k winrar mein jo book hai pdf format mein...to winrar ka password kese break karte hein??? help me.....