These Coin3D and SoWin libraries are built using Microsoft Visual Studio 2015. The release versions of these libraries (sowin1.dll, coin2.dll) have been compiled against the multithreaded dll version of the C run-time library. The debug versions of these libraries (sowin1d.dll, coin2d.dll) has been compiled against the debug multithreaded dll version of the C run-time library. Anyone who wants to use these libraries can use it directly in Microsoft Visual Studio 2015.