You need to add the meta tag to set the charset property to utf-8 in your html file. The HTML file that you want to convert to Word document.
I have tried your given word and its working fine after adding meta tag with charset property.
HTML File
Converted HTML File to Word Document
Kindly paste your code properly so that I will be able to understand your code easily and get can help you for your problem.
And please clear what you want to convert into a Word Document. An HTML File or Content of HTML like you are doing, converting DataGridView content to HTML then converting it to Word.
What issue you facing while using Interop library.
I have tried and HTML is generated successfully.
Screenshot
DataGridView
Converted HTML
Please share error details, where you are getting error.
Glad to assist!
