Hi, new to this site... thanks for all the great info! First.... sorry the heading is wrong... it's not quick Time files PC users can't open... it's my itune files in .mp4a. I am having trouble with PC users who visit my iweb site. They can't seem to listen to the audio files. I make my programs on garage band... share them with itunes and then drag them onto the website as .m4a's. What am I doing wrong? How can I change this thing? Here is a page on my site: http://web.me.com/cmillerfaith/Site...2009/2/21_Let_Not_YOUr_Heart_Be_Troubled.html they say they can read it but not get the program to work? What do I need to tell them? Thanks for your help.