Why QuickTime is recommended
Multimedia is still problematic on the web. Browsers are different, connection speeds are different, systems are different.
Java players: with some you could not access other functions in the window consistently; With others the quality of the delivery is not sufficient.
Windows Media Player: it can not show a 360° panoramic image.
QuickTime: It allowed both video and panoramas, as well as sound, so by using just one plug-in all multimedia could be played. The plug-in is available for both PC and Mac and works in all major browsers.