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RealPlayer formerly RealOne Player, is a cross-platform software product created by RealNetworks primarily used for the playing of recorded media. The media player is compatible with numerous formats within the multimedia realm, including MP3 , MPEG-4 , QuickTime , Windows Media , and multiple versions ( proprietary ) of RealAudio and RealVideo formats. [ 8 ] RealPlayer is also available for other operating systems (OS) and Linux , Unix , Palm OS , Windows Mobile and Symbian versions have been released. [ 9 ] The software is powered by an underlying open source media engine called Helix . [ 10 ] [ edit ] History The first version of RealPlayer was introduced in April 1995 as "RealAudio Player" and was one of the first media players capable of streaming media over the Internet .