Editions of Windows Media Player were also released for classic Mac OS, Mac OS X and Solaris but development of these has since been discontinued. Windows Media Player ( WMP) is a media player and media library application developed by Microsoft that is used for playing audio, video and viewing images on personal computers running the Microsoft Windows operating system, as well as on Pocket PC and Windows Mobile-based devices. com /en-US /windows /products /windows-media-player ActiveMovie Control, CD Player, DVD Player (Win32 version)