What is stdole2.tlb

Question

stdole32.tlb contains all base type definitions, and every lib must import it, if we use MIDL. But when I created ATL DLL project, lib file looks like that

import "oaidl.idl";
import "ocidl.idl";

[
    uuid(4CA3ADAD-AE53-4D80-AF26-176BAF8223B1),
    version(1.0),
]
library FirstATLLib
{
    importlib("stdole2.tlb");
};

I can't google what is in stdole2.tlb? Does it contain stdole32.tlb? And what else? Can someone helps me to find out?

Answer 1

You can use Windows SDK COM/OLE Object Viewer to open the type library and see what is there inside:

It defines certain interfaces and type you can use in your type library, since you make them available through referencing stdole2.tlb.