YASAPI/NT's version YASAPI_VERSION consists of

* "YASAPI_APP-YASAPI_VERSION-msc-gtk-bundle.exe":  the plug-in
  "YASAPI_APP.dll" compiled with a community edition
  of the Microsoft C compiler bundled with the GTK runtime
  and wrapped into a NSIS installer,
* "YASAPI_APP-YASAPI_VERSION-msc.exe":  the plug-in "YASAPI_APP.dll"
  compiled with a community edition of the Microsoft C compiler and
  wrapped into a NSIS installer,
* "YASAPI_APP-YASAPI_VERSION-msc.7z":  the plug-in "YASAPI_APP.dll"
  compiled with a community edition of the Microsoft C compiler and
  packed into a 7z archive which has to be unpacked and the plug-in
  copied to the directory "<Winamp root>/Plugins",
* "YASAPI_APP-YASAPI_VERSION-gcc-gtk-bundle.exe":  the plug-in
  "YASAPI_APP.dll" compiled with a MINGW edition
  of the GNU C compiler bundled with the GTK runtime
  and wrapped into a NSIS installer,
* "YASAPI_APP-YASAPI_VERSION-gcc.exe":  the plug-in "YASAPI_APP.dll"
  compiled with a MINGW edition of the GNU C compiler and wrapped
  into a NSIS installer,
* "YASAPI_APP-YASAPI_VERSION-gcc.7z":  the plug-in "YASAPI_APP.dll"
  compiled with a MINGW edition of the GNU C compiler and packed into
  a 7z archive which has to be unpacked and the plug-in copied to the
  directory "<Winamp root>/Plugins",
* "YASAPI_APP-YASAPI_VERSION.tar.gz":  the plug-in's source code, 
* "README":  this README file.

For further information refer to

    http://out-yasapi.sourceforge.net/index.html#2.3.2

Beyond that you'll need a GTK runtime for Winamp you might download from

    https://sourceforge.net/projects/yagtk-rt/files/
