RegSVR32

You can use the Regsvr32 tool (Regsvr32.exe) to register and unregister object linking and embedding (OLE) controls such as dynamic-link library (DLL) or ActiveX Controls (OCX) files that are self-registerable.

Regsvr32.exe is included with Microsoft Internet Explorer 3.0 or later, Windows 95 OEM Service Release 2 (OSR2) or later, and Windows NT 4.0 Service Pack 5 (SP5) or later. Regsvr32.exe is installed in the System (Windows
Me/98/95) or System32 (Windows NT, 2000, XP) folder.

Regsvr32.exe Usage

Regsvr32 [/u] [/n] [/i[:cmdline]] dllname

  /u - Unregister server

  /i - Call DllInstall passing it an optional [cmdline];
       when used with /u calls dll uninstall
  /n - do not call DllRegisterServer; this option must
       be used with /i