Rory Clark wrote:
> What exactly does the Dependency element do?
>   

Not much. It creates rows in the ModuleDependency table but it's up to 
consumers of the merge module to provide them. (Some setup authoring 
tools try to maintain a global list of merge modules and resolve 
dependent merge modules automatically; WiX doesn't, in favor of explicit 
authoring.)

> My belief, which appears to be incorrect, is that reference counting
> should be happening here so that if you uninstall the Extension, the
> ExtensionSDK is removed as nothing depends on it, but the
> ExtensionLibrary and ExtensionRuntime should both be left behind because
> Application depends on it.
>
> For starters, is this a correct assumption?
>   

No. Merge modules are simply a packaging convenience; once merged, the 
module's components become part of the consuming product (i.e.,  .msi). 
MSI bases all its reference-counting decisions on the component level. 
In your case, you have two products installing the components from 
ExtensionLibrary.msm so they get a ref count of two. The other 
components get a ref count of one so when you uninstall the Extension 
product, they get uninstalled.

What you want to do is add explicit Merge/MergeRef elements for both 
products.

-- 
sig://boB
http://bobs.org



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