ActiveXplorer 

Analyze and document binary components. ActiveXplorer is a library file manager and analyzer for COM libraries - ActiveX controls, TLBs, DLL and EXE servers - and .NET assemblies.
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TlbView 

The TlbView lets you examine type information for COM objects.Key TlbView futures: looks like internal Delphi/C++ Builder tlb editor; opens many type libraries at the same time; contains list of registered type libraries with quick filtering.
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