About QuickTime

Some AAFP multimedia presentations are designed for use with QuickTime. QuickTime allow the AAFP to "stream" large media files to you over the Web without downloading them to your computer. Note: The quality of the playback is affected by your computer processor speed and your Internet connection.

Download QuickTime(www.apple.com)
If you don't have QuickTime player, you can it for free from the Apple site.