Quicktime Player – QTPLUGIN.OCX
Qtplugin.ocx and quicktimecheck.ocx are ActiveX controls that installs with Apple's Quicktime media viewer. Quicktime may have been installed on its own or with Apple's iTunes software. You'll find this file in your Windows\System32 folder. These files are needed to make Quicktime work with your Microsoft Internet Explorer browser. If you don't use Quicktime, you can get by without these files.
More info on the latest Quicktime player for Windows can be found at http://www.apple.com/quicktime/download/.
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Apple