How do I get outlook web app custom add ins details?

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C#

VSTO

Outlook

AddIn

setup

, +

I am working on outlook (2016) add ins using VSTO and C#. I have created a setup to install my VSTO add ins and it works. There is a manifest xml file too for same add ins.

User can add custom add ins by manifest xml through outlook web app. Once it added through outlook web , it's available for desktop client. if User run my outlook add ins setup, he is getting same plugin twice - one from web another from COM.

So, Is there any way I can detect a particular add ins already added by outlook web manifest.xml during COM setup installation? I am using Visual Studio 2017 setup and deployment project.

I tried to search my manifest.xml GUID in registry but there is no entry regarding this in registry.

Thanks in advance.

What I have tried:

I tried to search my manifest.xml GUID in registry but there is no entry regarding this in registry. So, I can't call OnBeforeInstallation hander to check key in registry. It's looks outlook desktop client stores it somewhere else. I have tried to search it into appdata but not found so not sure where it stored or How it works to pull manifest installed custom add ins details by Outlook desktop client.