Opening Media file in MCI Metro Style Application

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C#

I'm trying to open a music file with MCI in metro style application. This code worked on wpf and windows form application, but it doesn't work on metro style application.I don't want to use media element.Please help.

Part of My code:

using System.Runtime.InteropServices;
using System.Text;

[DllImport("winmm.dll")]
        private static extern long mciSendString(
            string command,
            StringBuilder returnValue,
            int returnLength,
            IntPtr winHandle);

private void OpenMediaFile(string file)
        {
            string Command = "Open \"" + file +
                                "\" type mpegvideo alias hello";
            mciSendString(Command, null, 0, IntPtr.Zero);
            mciSendString("Play hello", null, 0, IntPtr.Zero);
        }


        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            OpenMediaFile(input1.Text.ToString()); //input1 is a textbox
        }