I don't know.
It confused me as well but up to DX 9c there was never the situation that 10 concurrent version (+-) existed and you needed to switch which runtime DLL which you use (which makes a difference on how the shader compiler behaves etc)
It confused me as well but up to DX 9c there was never the situation that 10 concurrent version (+-) existed and you needed to switch which runtime DLL which you use (which makes a difference on how the shader compiler behaves etc)