Microsoft Silverlight for Windows

Microsoft Silverlight is a programmable plugin for your web browser that allows you to use rich Internet applications such as animations, vector graphics, and audio-video playback.

Silverlight is a flexible programming platform that supports AJAX/VB, C#/Python, and Ruby and integrates with existing Web apps.

It allows for fast, efficient delivery of high-quality video to all major browsers that run on the Mac OS or Windows.