dll32\zlibwapi.dll :    The 32 bits DLL of ZLib 1.21
dll32\zlibwapi.lib :    The 32 bits import library for the DLL of ZLib 1.21
static32\zlibstat.lib : The 32 bits statis library of zLib 1.21 for Visual C++
dll32\zlib_bor.lib :    The 32 bits import library for the DLL of ZLib 1.21 for Borland C++

The zlib.h must be the version from zlib121.zip / zlib-1.2.1.tar.gz

Note :
  The DLL, named zlibwapi.dll, is compatible to the old zlib.dll built
  by Gilles Vollant from the zlib 1.1.x sources, and distributed at
    http://www.winimage.com/zLibDll
  It uses the WINAPI calling convention for the exported functions, and
  includes the minizip functionality. If your application needs that
  particular build of zlib.dll, you can rename zlibwapi.dll to zlib.dll.
