I know, but of course there is a reason for this. 
Visual Studio is a 32-bit app. So for you to be able to put an ActiveX control (OCX) in the Forms designer, we need to install the 
OCXs also in a special 32-bit variant. As these are linked against the CVCImg.dll, loading bmp, mio and emu works. For other files or drivers additional libraries are needed which then fail to load. (We only install the necessary 32-bit libraries to make the designer use case work.)