How do I install QuickTime from a .pkg? I'm on a laptop running OS X 10.3.9 (Panther) and I've downloaded "QuickTime 7.5 for Panther updater" -- and for the life of me I can't figure out how to install it.

The file mounts as a disk image. When I doubleclick it I see a QuickTime75_Panther.pkg file which opens when I double click. Inside I see a lot more files but nothing that lets me install. Help?
.pkg files are so called packages, which can be installed by Installer.app, so try right-clicking the .pkg file and hit Open with -&gt; Installer