基于32位或64位操作系统运行先决条件

Question

如何检查系统是32位还是64位，然后运行正确的silverlight安装程序？

[Run]
Filename: "{tmp}\Silverlight_x64.exe"; Check: SilverlightIsNotInstalled ; Flags: nowait

[code]
function SilverlightIsNotInstalled: Boolean;
   begin
Result := not RegKeyExists(HKEY_LOCAL_MACHINE, 'SOFTWARE\Microsoft\Silverlight');
end;