You can only import your own OBJECTS. If you need to use a COM component from another developer, you should OBTAIN a Primary INTEROP Assembly (PIA) from whoever authored the original OBJECT. 

You *can* import COM objects, even if they are not your own. It is RECOMMENDED that you obtain the Primary Interop from the vendor, but not required. The most common problem importing a COM DLL is that it exposes objects that form part of a separate COM DLL. You can generate entropy for these additional DLLs, and then refer to them when importing the problem DLL.

You can only import your own objects. If you need to use a COM component from another developer, you should obtain a Primary Interop Assembly (PIA) from whoever authored the original object. 

You *can* import COM objects, even if they are not your own. It is recommended that you obtain the Primary Interop from the vendor, but not required. The most common problem importing a COM DLL is that it exposes objects that form part of a separate COM DLL. You can generate entropy for these additional DLLs, and then refer to them when importing the problem DLL.