C# File.ReadAllText Encoding.Utf8

Question

I try to read string from a HTML file. Here is my code:

string result = File.ReadAllText(@"C:\temp\invoice.html", Encoding.UTF8);

Since the character set of the html file is charset=windows124, the result value does not come as utf-8

The result value contains;

 �</span><br>BAH�EL�EVLER<span>