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The run-time functionality for XML file changes requires the presence of Microsoft XML Core Services (MSXML) 3.0 or later on the target system.
When an installation that contains XML file changes runs on a target system, MSXML parses the XML file and executes the XPath expressions that are associated with the changes that you configured. When MSXML finds an area of the XML file that matches the XPath expression, the changes that were configured in the XML File Changes view are made.
InstallShield includes redistributables for different versions of MSXML. If it is possible that target systems may not have MSXML, or they may not have the appropriate version of MSXML, you can add the appropriate MSXML redistributable to your project in either the Redistributables view (for Basic MSI and InstallScript MSI projects) or the Prerequisites view (for InstallScript projects).
For detailed information about MSXML, see the