LPCWSTR relative path to shader issue while launching main c# application and not C++ submodule (.lib)

Question

I'm building C# application with some C++ code just for rendering (following this great tutorial - https://gist.github.com/d7samurai/aee35fd5d132c51e8b0a78699cbaa1e4), but I got stuck at line 130 - decompiling from shader.

When code is run just in C++ (for testing only) is works great, as well as when I launch it up from C# and set up absolute path to shader file (2 versions working fine below)

C++ Engine only working version:

    D3DCompileFromFile(L"TestShader.hlsl", nullptr, nullptr, "vs_main", "vs_5_0", 0, 0, &vsBlob, nullptr);

C++ Engine and C# absolute path working version:

    D3DCompileFromFile(L"E:\\Coding\\CPPEngine\\Graphics\\Shaders\\TestShader.hlsl", nullptr, nullptr, "vs_main", "vs_5_0", 0, 0, &vsBlob, nullptr);

but I want C#-working relative path to my CPP engine.lib working, so something like this:

   D3DCompileFromFile(L"..\\CPPEngine\\Graphics\\Shaders\\TestShader.hlsl", nullptr, nullptr, "vs_main", "vs_5_0", 0, 0, &vsBlob, nullptr);

or

   D3DCompileFromFile(L"..\\CPPEngine.lib\\Graphics\\Shaders\\TestShader.hlsl", nullptr, nullptr, "vs_main", "vs_5_0", 0, 0, &vsBlob, nullptr);

Just for clarification application is split in 3 modules like this:

• MainApplication(C# .exe)
• CPPLink(C++ .dll)
• CPPEngine(C++ .lib)

and the linking was working fine so far. The problem seems to be just with relative path to shaders - HRRESULT says HRESULT_FROM_WIN32(ERROR_PATH_NOT_FOUND) when trying examples 3 or 4.

All the files - that is:C# .exe,C++ .dll and C++ .lib are all dumped to one output folder right now (different than the source one obviously)

Is it just path issue? or I have to setup some entry points to .lib first? CPPEngine Character set is Not Set if that matters.