Created Unassigned: WaveFileReader & MediaFoundationReader Error [16426]

Hey,
I'm trying to read the length of WAV and AAC/M4A-Files, but it always throws an Exception "Unsupported File".
I tried it with different codes, but it always throws the same Exception.

1st try:
```
public System.TimeSpan getTotalTime(string path)
{
waveOutDevice = new WaveOut();
System.TimeSpan time = new TimeSpan();
if (path.EndsWith(".mp3") == true)
{
time = new Mp3FileReader(path).TotalTime;
}
if (path.EndsWith(".aac") == true | path.EndsWith(".m4a") == true)
{
time = new MediaFoundationReader(path).TotalTime;
}
if (path.EndsWith(".wav") == true)
{
time = new WaveFileReader(path).TotalTime;
}
return time;
}
```

2nd try
```
public System.TimeSpan getTotalTime(string path)
{
waveOutDevice = new WaveOut();
System.TimeSpan time = new TimeSpan();
if (path.EndsWith(".mp3") == true)
{
mainOutputStream = new WaveChannel32(new Mp3FileReader(path));
}
if (path.EndsWith(".aac") == true | path.EndsWith(".m4a") == true)
{
mainOutputStream = new WaveChannel32(new MediaFoundationReader(path));
}
if (path.EndsWith(".wav") == true)
{
mainOutputStream = new WaveChannel32(new WaveFileReader(path));
}
return mainOutputStream.TotalTime;
}
```

None of my trys worked. I also tried different versions.
It should be able to check the Total Length before playing the files, but even if the files are played, i get the same Exception "unsupported file".
But MP3 is working. Only WaveFileReader and MediaFoundationReader are throwing this Exception.
Hope you can help me :)