reading in HTML pages with unicode and ANSI

[SStarker]

I'm reading in the HTML pages and taking some texts out of each one. I'm adding those texts to the RichTextBox and displaying them. I have done
string text = System.IO.File.ReadAllText(filename, Encoding.Default); // reads items like á
but it changes the Unicode glyphs to something unrecognizable. Also, I have done
and
string text = System.IO.File.ReadAllText(filename, Encoding.UTF8); // reads items like ɨ
but it changes the ANSI characters to a black diamond with a white question mark inside.

I need Unicode and ANSI in each HTML page. Is that possible? If I can ask, how would you do it?

Thanks.

Scott