MPC-BE is a free and open source audio and video player for Windows.
MPC-BE is based on the original Guliverkli project and "Media Player Classic Home Cinema" project, contains additional features and bug fixes.
LAV Filters - ffmpeg based DirectShow Splitter and Decoders
LAV Filters are a set of DirectShow filters based on the libavformat and libavcodec libraries
from the ffmpeg project, which will allow you to play virtually any format in a DirectShow player.
The filters are still under development, so not every feature is finished, or every format supported.