Inno Setup - 如何在没有提示消息的情况下保存Xml节点

I want the installer to edit a xml file in silence, without promp messages, that if the xml file exist in destination location, the installer edit it, and if do not exist in destination location, the installation continue and ignore that the xml file do not exist without prompt message. I saw the CodeAutomation.iss but that do not help me. Please help with a code sample.I want the installer to edit a xml file in sile