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Can't resolve "The type or namespace name 'mshtml' could not be found" error

I added Microsoft HTML Object Library as COM Type Libraries to use mshtml .

I could build the project when I used in Visual Studio 2017. But after updating to Visual Studio 2019, there is a error The type or namespace name 'mshtml' could not be found .

I have no idea why the library is not recognized.

How can I resolve the error?

I installed Unofficial.Microsoft.mshtml from NuGet package manager, then the problem was resolved.

I don't know why official dll doesn't work, though.

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