If you’ve installed the preview edition of QuickTime 6, but want to go back to the previous version, Apple has a solution for you.
They’ve released QuickTime 5 Reinstaller for Mac OS X that removes the QuickTime 6 Public Preview and restores the version of QuickTime provided in Mac OS X 10.1.3 or greater. The 13.3MB file is now available for download and requires, as you might expect, Mac OS X 10.1.3 or greater.
On June 4 Apple released a preview edition of QT 6. QuickTime 6 is the industry’s first mainstream MPEG-4 solution for streaming media to all MPEG-4 compliant players.