k-lite mega codec pack/quicktime codecs to play other files

I want to be able to use quicktime for all video files on my new ibook 14'' so i tried downloading the k-lite maga codec pack but i think its only for windows because every site i tried to download it from opened it in a .exe file. basically i was wondering if there was a site to find a version of k-lite to download that works with os x tiger or if there was another codec download that would enable me to play other media files on quicktime (wmv,mpeg-4). i already downloaded the divx codecs to play .avi files but i really want to be able to play those other files