to make a game iso or cso file from a rar file you will need 7zip or win-rar just use one of these programs
a handy guide on different file types http://www.epforums.org/showthread.p...ght=file+types
7zip website
http://www.7-zip.org/
winrar website
http://www.win-rar.com/download.html
video tutorial of how to use these programs
http://www.youtube.com/watch?v=DOLp0vRiJg4
remember you only need one not both of these programs.