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Title
Make a Property Available During Uninstall Maintenance and During Patching

Summary

This article describes how to configure your setup to persist these property values for further operations on the installed package.

Synopsis

Windows Installer does not persist changes made at runtime to the MSI Database, which makes it not possible by default to gain access to property values that a User or other Custom Action may have changed during the initial installation while running Maintenance or Uninstalls. This article describes how to configure your setup to persist these property values for further operations on the installed package.


Discussion

1. Create a registry key similar to the following:
HKLM\Software\My Company Name\My Product Name\
2. Set a value for this key using the name/value pair of your custom property:
Name: MYPROP
Value: [MYPROP]
This will write the value of the custom property to the registry during installation.
3. Create a System Search to search for the registry entry, and then store it in the same named property you used in step 2 (MYPROP).
Given the above steps, what will take place is that during Uninstall and Maintenance the AppSearch action will still run, and reset the default value of MYPROP to the value you wrote to the registry during the initial installation. This will also allow for changes to the property during the User Interface of Maintenance operations, since the new value will be written for later usage.
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Make a Property Available During Uninstall Maintenance and During Patching