This indicates an attempt to use Windows Media Player to watch online videos.
Windows Media Player is a media player and media library application developed by Microsoft. It is used for playing audio and video files, as well as for viewing images on personal computers. In addition to being a media player, Windows Media Player includes the ability to rip music from and copy music to compact discs, synchronize content with a MP3 player or other mobile devices, and enable users to purchase or rent music from a number of online music stores. The default file formats are Windows Media Video (WMV), Windows Media Audio (WMA), Advanced Systems Format (ASF), and its own XML based playlist format called Windows Playlist (WPL). The player is also able to utilize a digital rights management service in the form of Windows Media DRM.