Atmega8 .hex code to arduino .pde file?

is it possible to convert an atmega8 .hex code to arduino .pde file? i want to use an arduino to convert the signals from one type of game controller to a gamecube controller. basically i want to do this (a href="http://www.raphnet.net/electronique/x2wii/index_en.php)" rel="nofollow"http://www.raphnet.net/electronique/x2wi…/a but use an arduino as the microcontroller