I am busy building a C# program to automate mail merging, and one of the extensions to use/read MS Word is Interop.Word (the other is Syncfusion, from the tutorial I saw it gave the feeling it need a license).

I'm following along this tutorial: https://www.youtube.com/watch?v=yj6mIe8cyZ8

At about 4:32

When I use NuGet Interop.Word, the program doesn't run and throws this error:

Could not load file or assembly 'Microsoft.Office.Interop.Word, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c'

When I add a reference to the Microsoft Word Image Library, not only does it conflict with Interop.Word, but I can't use some of the code mentioned in the tutorial.

Examples being application.Documents.Add & application.Visible.

I believe for the first error I need to install a DLL and paste it to the bin, correct?

If you know of any other extensions to use for mail merging, please let me know.

I've heard of an extension called OpenXML