regsvr32 is windows equivalent to ldconfig in Linux. It is a command-line utility in Microsoft Windows operating systems for registering and unregistering DLLs and ActiveX controls in the Windows Registry.
One important fact is to use regsvr32, a DLL must export the functions DllRegisterServer and DllUnregisterServer
regsvr32 abc.dll for registering a file
regsvr32 /u abc.dll for unregistering a file