Apple has released QuickTime Player 7.6.6. The 10.65MB download requires Mac OS X 10.6.3 or higher.
This is all Apple has to say about the update: “QuickTime Player 7 supports older media formats, such as QTVR, interactive QuickTime movies, and MIDI files on Snow Leopard. It also accepts QuickTime 7 Pro registration codes, which turn on QuickTime Pro functions.”
You can obtain QuickTime Player 7.6.6 via the Software Updates component of Mac OS X’s Systems Preferences app.