Someone

using System;

public class TestUri {

	public static void Main (string [] args)
	{
		DoTest ("file:///foo/a%F0%90%84%80b");
	}

	private static void DoTest (string uristr)
	{
		Console.WriteLine ("Using string: {0}", uristr);
		Uri uri = new Uri (uristr, true);
		Console.Write("Uri: ");
		foreach (char c in uri.ToString ())
			Console.Write ("{0:X04} ", (int) c);
		Console.WriteLine ();
		Console.Write("Path: ");
		foreach (char c in uri.LocalPath)
			Console.Write ("{0:X04} ", (int) c);
		Console.WriteLine ();
	}
	
}