What reference do I need to use Microsoft.Office.Interop.Excel in .NET?

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Update (thanks user2347528)

These assemblies are available as NuGet packages, which is much easier than my original answer.

You can install by either right clicking on References in your project and selecting Manage NuGet packages… and searching for one of the packages listed below, or install using the Package Manager Console:

PM> Install-Package Microsoft.Office.Interop.Excel

These are available as “Primary Interop Assemblies”, which can be installed with Office, or downloaded and installed separately. How to: Install Office Primary Interop Assemblies.

Once those are installed, you can reference them in your project in the Add Reference dialog, under .NET. If you do not see those Microsoft.Office.Interop assemblies listed, then they have not been installed yet. Install them from your setup, or download and install them separately (see my link above for the downloads).

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