One of the best multi-format media player for Windows

VLC Media Player
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VLC Media Player

VideoLAN team  -  Open Source

VLC Media Player (formerly VideoLAN Client) is a highly portable multimedia player for various audio and video formats, including MPEG-1, MPEG-2, MPEG-4, DivX, MP3, and OGG, as well as for DVDs, VCDs, and various streaming protocols. It also can be used as a server for unicast or multicast streams in IPv4 or IPv6 on a high-bandwidth network.