'ReactOS 0.3.13', and 'MPlayer (2010-10-17)'

ReactOS 0.3.13

ReactOS is a free, modern operating system based on the design of Windows XP/2003. Written completely from scratch, it aims to follow the Windows-NT architecture designed by Microsoft from the hardware level right through to the application level. This is not a Linux-based system, and shares none of the Unix architecture.

http://www.reactos.org

MPlayer (2010-10-17)

MPlayer is a movie player for Linux but there is a port for MS Windows. It plays most video files, including: MPEG, VOB, AVI, Ogg/OGM, VIVO, ASF/WMA/WMV, QT/MOV/MP4, FLI, RM, NuppelVideo, yuv4mpeg, FILM, RoQ, PVA, Matroska files, supported by many native, XAnim, RealPlayer, and Win32 DLL codecs. The player can manage damaged MPEG files (useful for some VCDs), and it plays bad AVI files which are usually unplayable with Windows Media Player.

http://www.mplayerhq.hu

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