Visual Studio Extension MEF class not instantiated when installed via an MSI?

The behavior you are seeing is by design; assemblies are included in the MEF composition only if they're listed in a . Vsixmanifest somewhere. When you added the Package registry keys through your MSI, this will not add your assemblies to the MEF composition.

When were you were testing in the experimental hive or installing the extension directily, you were including your assembly into the MEF composition as you expected.

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