DLLs (dynamic link libraries) need to be registered with Windows to function correctly. This is done by using the REGSVR32 command-line tool, which adds DLLs to the system by introducing an entry for them into the registry and allowing them to function as an OLE/COM/DCOM automation object. A registered DLL must be unregistered (also by using REGSVR32) before it can be replaced with a newer version.
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