Apple has released QuickTime Player 7.6.6 for Mac OS X 10.6.3 Snow Leopard with absolutely no release notes, so there's no telling what has changed. Remember that Snow Leopard now comes with a new QuickTime Player for QuickTime X, so the only reason you would want QuickTime Player 7 is because it 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. Apple explains more at this Knowledge Base article. (Free, 10.65 MB)
Mac OS X Zip Expanding Utility
Firefox (and possibly other applications) may ask you what you want to do with .zip archives that you download from the Internet. If you want to expand them with Mac OS X (rather than StuffIt Expander), you may be unsure of which application actually does the job. You're looking for Archive Utility (in Leopard and later) or BOMArchiveHelper (in Tiger). In either case, the application is stored in Hard Drive/System/Library/Core Services/. Don't move it from there, though, or you'll confuse matters.
QuickTime Player 7.6.6 for Mac OS X 10.6.3
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