The WR-G39DDC API SDK is implemented as a 32-bit dynamic library (G39DDCAPI.dll). It provides both object-oriented and non-object-oriented interfaces to control the WiNRADiO G39DDC receiver. The API can be used by any 32-bit application under Microsoft Windows XP, Vista, Windows 7, Windows 8 and Windows 10 (including their 64-bit versions).
A C/C++ header file G39DDCAPI.h is a part of the SDK.
The G39DDCAPI.DLL API file is available as a standard part of the WiNRADiO G39DDC application installer which is supplied with the receiver and can be also downloaded here.