Why can't I open Quicktime files in Safari

Other brousers work, but not Safari.

Quit Safari.
Open the Library folder in your home folder as follows:
☞ If running OS X 10.7 or later, hold down the option key and select Go ▹ Library from the Finder menu bar.
☞ If running an older version of OS X, select Go ▹ Go to Folder… from the Finder menu bar and copy the line below into the text box that opens:
~/Library
Delete the following items from the Library folder:
Caches/com.apple.Safari/Cache.db
Preferences/com.apple.quicktime.plugin.preferences.plist
Preferences/QuickTime Preferences
Relaunch Safari and test.

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