My game files dont show up

Hello all.
I downloaded my emulator and and i followed a guide and with the help of my brother who had his working. But, my problem arises when I look to load a game, I downloaded it and put it in the folder containing the emulator but when I click 'File' and 'RUN Iso' the game file is not shown therefore I cannot load it.Curious is any one knew of a way to get it to work. Thanks..

Make sure to extract all the files from the .rar file first,
http://www.rarlab.com/