1) Tango_DLL.dll = 32 Bit DLL 2) Tango_DLL64.dll = 64 Bit DLL 3) Tango.cpp, Tango.h = Valid for 32 and 64 Bit DLL 4) Tango.cpp, Tango.h also available for Microsoft Visual Studio 2008-2010 development environment: --> Browse to Folder \Visual Studio 2008-2010\