vgmstream is a library for playing a wide variety of streamed audio formats used in video games. It currently comes with source for Winamp, Audacious, and foobar2000 plugins, and a command line decoder that outputs PCM .wav.
The best place to look now for active development is in kode54's repo. He maintains the foobar2000 component.
The last Winamp and Windows command line build I have posted is r1050-50-gd22a43b (2016-07-01), built from this branch.
Since version r1040 there has been no more development on the repository on SourceForge.
Halley's Comet Software