The Windows Registry is a hierarchical database that stores low-level settings for the operating system and applications. Among its most arcane yet powerful keys are those under CLSID (Class Identifiers). These GUIDs (Globally Unique Identifiers) map to COM (Component Object Model) objects, which are the building blocks of countless Windows features—from context menu handlers to file previewers.
If you instead wish to register a functional DLL: The Windows Registry is a hierarchical database that