Playing .wma files with NAudio in C#

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C#5.0

I'm working on a C# app in Visual Studio 2013 that needs to play audio files in .wav, .mp3 and .wma formats. the .wav and mp3 files play with no problem. .wma files, however, seem to require extra handling and I'm at a loss to find a solution.

Here are the using statements at the top of the project file:

using NAudio;
using NAudio.Wave;
using NAudio.FileFormats.Wav;
using NAudio.FileFormats.Mp3;
using NAudio.WindowsMediaFormat;
using NAudio.MediaFoundation;

And here's the code for playback:

private void PlayIntroScreenAudio()
{
    Player.Stop();
    byte[] IntroAudioInBytes = Convert.FromBase64String(GameInfo.IntroScreenAudio);
    MemoryStream msIntroAudioStream = new MemoryStream(IntroAudioInBytes, 0, IntroAudioInBytes.Length);
    msIntroAudioStream.Write(IntroAudioInBytes, 0, IntroAudioInBytes.Length);
    msIntroAudioStream.Seek(0, SeekOrigin.Begin);
    msIntroAudioStream.Position = 0;

    if (GameInfo.IntroScreenAudioFileExt == ".wav")
    {
        WaveFileReader wfr = new WaveFileReader(msIntroAudioStream);
        Player.Init(wfr);
    }
    else if (GameInfo.IntroScreenAudioFileExt == ".mp3")
    {
        Mp3FileReader mp3rdr = new Mp3FileReader(msIntroAudioStream);
        Player.Init(mp3rdr);
    }
    else if (GameInfo.IntroScreenAudioFileExt == ".wma")
    {
        WMAFileReader wmafr = new WMAFileReader(msIntroAudioStream);
        Player.Init(wmafr);
    }
    Player.Play();
    IntroAudioIsPlaying = true;
    FinalScoreAudioIsPlaying = QuestionAudioIsPlaying = CARAudioIsPlaying = IARAudioIsPlaying = false;
    btnPlayIntroScreenAudio.Image = Properties.Resources.btnStopIcon;
    btnPlayFinalScoreAudio.Image = btnPlayQuestionAudio.Image = btnPlayCorrectResponseAudio.Image =
        btnPlayIncorrectResponseAudio.Image = Properties.Resources.btnPlayIcon;
    Player.PlaybackStopped += Player_PlaybackStopped;
}

As you'll probably guess, I get a wiggly line under "(msIntroAudioStream)". I tried adding ".ToString()" inside the parentheses, but the app crashes, since wmafr can't read from a string. What other code do I need to play a .wma file?