[Win10 UWP, VS2015RC] System.Text.Encoding.GetEncoding raise exception

Question

Hi,

I have a trouble with System.Text.GetEncoding at windows universal  prooject.

Following code raise an exception "'shift-jis' is not a supported encoding name. For information on defining a custom encoding, see the documentation for the Encoding.RegisterProvider method.". This snippet use "shift-jis", but also other encoding names cause same exception like as "Windows-1252", etc.

            System.Text.Encoding enc = null;
            try
            {
                enc = System.Text.Encoding.GetEncoding("shift-jis");
            }
            catch(Exception ex)
            {
                ex.GetType();
            }

Here is an matrix of ok/fail. only VS2015RC UWP project fails.

VS2013, StoreApp project : OK

VS2015CTP6+Win10SDK, Windows universal project : OK

VS2015RC+SDK10069, Win8.1 StoreApp project : OK

VS2015RC+SDK10069, Windows Universal Project : Fail

I know that .NET 4.6 Preview have some restrictions about encoding, but UWP use ".NET for Windows Store apps", the .NET version  is 4.5.1.  I'm confusing..

Thanks in advance,

pnp0a03