I need on the end of uninstallation to check if some registry key exist,
and if yes I want to display message box with restart prompt.

I have only small knowledge about custom action and launch conditions.
Can you give me tip what to add into my *.msi wizard project to solve this
task ?
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You want to learn all about the AppSearch table and how it is used to populate a Property based on the existance of a registry key. It does files, ini, components too but you want the registry.

Start with the AppSearch table documentation (this defines what property to populate based on what signature) and move on to the RegLocator Table documentation (this defines exactly what registry key you are searching for).

Start by creating a property in the Property Table, create an entry in the AppSearch Table that links to the property, create an entry in the RegLocator Table that links to the entry in the AppSearch Table.

That will populate a value in the Property Table with a True/False, which you use as a condition for your message box.
Answered 04/19/2005 by: VikingLoki
Second Degree Brown Belt

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