What is it?
QuickTime Player is a free multimedia player. You can use it to view many kinds of files, including video, audio, still images, graphics, and virtual reality (VR) movies. QuickTime supports the most popular formats on the Internet for news, sports, education, movie trailers, and other entertainment. The QuickTime application from Apple, Inc. includes a browser plugin that enables you to play movies and other online media in your Web browser. With the QuickTime plug-in (part of the free QuickTime
Description of npqtplugin4.dll from Apple
“A powerful multimedia technology with a built-in media player, QuickTime lets you view Internet video, HD movie trailers, and personal media in a wide range of file formats. And it lets you enjoy them in remarkably high quality. QuickTime is integrated with Mac OS X, but was once an optional component during installation for earlier versions of Mac OS. QuickTime for Microsoft Windows is downloadable, either as a standalone installation or bundled with iTunes or optionally with Safari.”