2014/1/15 Ruth Lu <ruth...@intergraph.com>:
> Hi,
> I got a problem during uninstall:
>
> Our COM project (build by install shield) and WIX project shared some common
> files.
>  In WIX, during uninstall, I want to check if our COM project is installed
> or not through registry.
>
> If COM project is installed, I don’t want to uninstall these shared
> component; if not, I want to uninstall these components.

Use the same component GUIDs on both projects and it will Just Work.
You don't need to add special logic for conditional uninstallation.

-- 
Nicolás

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