VLC Media Player is the most popular and robust multi format, free media player available.
The controls are intuitive, and playback works smoothly regardless of the source of the media being displayed.
On the visual side, the application stays clean, with no shiny buttons or elements to enhance the interface.
the program is capable of handling a huge variety of file formats, for example, AVI, DVR-MS, FLV, MIDI, QuickTime File Format, MP4, OGM, WAV, MPEG-2, DVD-Video, VCD, SVCD, CD Audio, MJPEG, MPEG-1, MPEG-2, MPEG-4 Part 2, RealVideo, RealAudio, TTA, Vorbis, WavPack, WMA, among many others.
VLC Media Player is quite simply the best multimedia application for Windows and Mac.