XML File Changes Fails to Update an XML File Installed on the UNC Path

Title

Summary

XML File Changes fails to update an XML file located on a UNC Path (i.e., \\server\folder\abc.xml).

Symptoms

Sometimes, XML File Changes fails to update an XML file located on a UNC Path (i.e., \\server\folder\abc.xml). The install log shows the XML File Changes Custom Action returning error "Access is Denied". This can happen even if the install successfully installs the file to the UNC path.

Cause

By design, Microsoft Windows Installer runs install actions in either 'User Context' or 'System Context'. When a Custom Action is created, it must be defined to run in one of these contexts. By default, InstallShield's ISXMLInstall Custom Action performing the XML Files Changes is defined to run in 'System Context'. In order to successfully modify an XML File located on a shared network location, the Custom Action must be run in 'User Context'.

Resolution

To resolve the issue, change the 'In-Script Execution' value of the ISXmlInstall Custom Action:

Using InstallShield, open the install project, and select the 'Installation Designer' tab.
In the left pane, go to the 'Behavior and Logic'->'Custom Actions And Sequences' view
In the middle pane, expand the 'Custom Actions' node, and click on the Custom Action named 'ISXMLInstall'
In the right pane, click on the far right of the 'In-Script Execution' row and use the drop down menu to change the value from 'Deferred Mode In System Context' to 'Deferred Execution'.
Rebuild the project

Additional Information

For more information about the XML File Changes view in InstallShield, please refer to InstallShield Help article Overview of XML File Changes

For information about the custom-action's In-Script Execution field, please refer to Microsoft Windows Installer article --> Custom Action In-Script Execution Options

For information on User-Context and System-Context for Custom Actions, please refer to the Microsoft Windows Installer article --> Custom Action Security

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Case id: 00001065