iPhone5,1_9.3.3_13G34_Restore.ipsw ita winrar file how i can flash

i have iphone 5 idownload this file http://forum.gsmhosting.com/vbb/f812…nload-1511373/
this link but file is winrar, how i can flash this file by itune

iPhone5,1_9.3.3_13G34_Restore.ipsw