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RealPlayer, though hard to believe, is nearly 17 years old this year. Available on a wide variety of platforms, and even on mobile devices, in theory it could be one of the best media players on the planet.
But the sluggish, slow and packed full of crapware software was nothing but a plague on millions of computers worldwide. Spyware was even found to be in the software, which led to a massive boycott and controversy surrounding the company that makes the software.
Though it supports MP3s, MPEG-4 formats, QuickTime and Windows Media formats, the only reason anyone would use it is if they were forced to, by needing to view or listen to its propriety RealAudio and RealVideo formats.
It's no VLC, suffice to say.