RegSvr32
             Unrecognized flag: /?

             Usage: regsvr32 [/u] [/s] [/n] [/i[:cmdline]] dllname
             /u -     Unregister server
             /s -     Silent; display no message boxes
             /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