The Microsoft OLE/COM Object Viewer (oleview.exe) is an essential administrative utility supplied within the Windows SDK. It provides a high-level, human-readable view of the Component Object Model (COM) and Object Linking and Embedding (OLE) components registered on a computer, extracting structure from raw Windows Registry data.
For modern developers, reverse engineers, and security analysts, it serves as a foundational window into how the OS handles binary interoperability. Core Purpose & Capabilities
The utility acts as a specialized system browser. Instead of manually navigating long lists of Class IDs (CLSIDs) in regedit, it automatically organizes system components into structural tree views with recognizable, friendly names.
Enumerate Registered Objects: It scans the machine to list all ActiveX controls, Automation objects, insertable OLE documents, and internal system components.
Interface Inspection: Users can expand any component node to instantly see the specific, strongly typed interfaces it supports.
Type Library Reconstruction: The built-in ITypeInfo viewer can open .tlb, .ocx, or .dll files and decompile them back into raw standard Interface Definition Language (IDL) code.
Registry Diagnostics: It displays the system access permissions, implementation pathways, and hosting configuration parameters for both local COM and Distributed COM (DCOM) setups. Key Workflows and How to Use It
The viewer requires administrative context to function properly because it must register its own parsing and viewing DLLs (iviewers.dll) on its initial run. OLE/COM Object Viewer – Win32 apps | Microsoft Learn
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