The WR-G31DDC API SDK is implemented as a 32-bit dynamic library (G31DDCAPI.dll). It provides both object-oriented and non-object-oriented interfaces to control the WiNRADiO G31DDC receiver. The API can be used by any 32-bit application under Microsoft Windows 2000, XP, Vista, Windows 7, Windows 8 and Windows 10 (including their 64-bit versions).
A C/C++ header file G31DDCAPI.h is a part of the SDK.
The G31DDCAPI.DLL API file is available as a standard part of the WiNRADiO G31DDC application installer (version 1.30 onwards) which is supplied with the receiver and can be also downloaded here.