See
http://blogs.msdn.com/b/heaths/archive/2009/12/21/about-shared-components.aspx
> From: nicolas.alva...@gmail.com
> Date: Tue, 1 Oct 2013 00:51:36 -0300
> To: wix-users@lists.sourceforge.net
> Subject: [WiX-users] Practical use of wixlibs
>
> I can't find any documentation on best-practices when creating either
> merge modules or wixlibs, only procedure documentation on how to
> create them.
>
> Let's say I create a wixlib (or msm) with multiple components that
> make up a large C++ library. Someone making an application with that
> library can then use the wixlib and only write installation code for
> his own app files, instead of having to also define the installation
> of the library.
>
> But where would the library be installed? Would the wixlib need to
> have a Directory under (say) Common Files where the library would go?
>
> Or can the wixlib provide a way for the application wxs to decide
> where the library would be installed? But then there's a problem: two
> applications importing the same wixlib could install the same
> components (with same GUID) in different directories. As far as I know
> that means only the first one would get installed, the second would
> see the component is already installed (identified by GUID) and do
> nothing.
>
> Does anyone have experiences to share?
>
> --
> Nicolás
>
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