There a couple of files that are added to the AddIn setup package by
default...

Extensibility.dll, VSLangProj.dll, and vslangproj.tlb.

Why?  If you are creating an AddIn for Visual Studio, those are already
installed on the client computers...otherwise, they would not be able to run
VS .. or macro's....so, why are they included?

The reaoson I am asking is...when you install/uninstall for debugging
purposes...occasionally during the uninstall, the uninstaller unregisters
VSLangProj.dll and Extensibility.dll ... therefore, you can't add classes to
existing projects or use any other type of wizard because they use the
Extensibility.dll and VSLangProj.dll assemblies....

bug?

Thanks,
Mythran