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Implement Direct3D info collector in the library d3dcore.
It should use IDxDiagContainer COM interface for enumerating sub-containers and properties.
d3dcore is not responsible for storing the information, it will be the responsibility of our future system3dinfo library, where we will save it in tree-structured storage.
Interface between d3dcore and system3dinfo to be discussed

Here is a very simple example:
http://doc.51windows.net/Directx9_SDK/intro/tools/dxdiagref/ifaces/idxdiagcontainer/getchildcontainer.htm

d3dcore should be DLL, because it's not necessary it's present in the system

• create system3dinfo
• without any code, saving data, try several possible models of requesting system-dependent data from d3dcore

Very rough sketch:
H:
TreeStorage storage_;

Cpp:
handle = LoadLibrary("d3dcore.dll");
// ...
EnumerateDirect3DInfo(...);

On the stage EnumerateDirect3DInfo storage_ should be filled with tree-structured data from DX containers

Design and implement TreeStorage class for saving cross-platform and cross-version 3D graphic data. It should not search for particular DLL ar determine the system, it's main function is to store data

System3DInfoEngine is responsible for collecting information about OS and graphical APIs present in the system. Depend on it, it loads DLLs or SO responsible for one or another API and fill TreeStorage with the data about 3D graphical profile of the system