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Mac OS X v10.6 Snow Leopard includes QuickTime X which comes with a new QuickTime Player, offering a clean and uncluttered interface, easy media sharing, and flexible recording capabilities.

Should you need it, a Snow Leopard-compatible version of QuickTime Player 7 is also available for use with older media or with existing AppleScript-based workflows. QuickTime Player 7 can be used to playback formats such as QTVR, interactive QuickTime Movies, and MIDI files. Also, it supports QuickTime 7 Pro registration codes for access to QuickTime Pro functionality.

support.apple.com/HT3678 - Preview

SnowLeopard 10.6 QuickTimePro QuickTimeX OS_X OSX