If you running a Remote Desktop Server under Windows 2008 R2 and have installed Apple QuickTime, remote dekstop users might get this meassage when they try to view for example trailers at apple.com:
Download QuickTime to view this video.

To solve this you need to either add the website to sites under trusted sites in internet options or enable “Script ActiveX controls marked safe for scripting” for the internet zone in internet options.