regsvr32 on Windows 64 bits

On a 64-bit version of Windows operating system, there are two versions of the Regsv32.exe file:

• The 64-bit version is %systemroot%\System32\regsvr32.exe.
• The 32-bit version is %systemroot%\SysWoW64\regsvr32.exe.

RegSvr32.exe has the following command-line options:

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

/u - Unregister server 
/i - Call DllInstall passing it an optional [cmdline]; when it is used with /u, it calls dll uninstall 
/n - do not call DllRegisterServer; this option must be used with /i 
/s – Silent; display no message boxes