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Not that familar with the Excel addin project, so I created an addin project and added a class library project to the solution (the solution contained ExcelAddin1 and Excel.Text projects). In the...

I don't see the problem. When the add-in is published and the installation exe is created, what goes wrong.

Files don't get put where they're needed?

The add-in can't find the files?

Where...

Write an install program for your app.

Why do you need to put files directly in the C drive? What happens if there isn't a C drive? Your app should not rely on any special hardcoded file path to...