Hololens Load File to Stream

I'm having an issue trying to read a basic text file and load the data to my app. I'm using IL2CPP to build the app, and pre-processors to surround the async parts.

I'm using this as my read.

Code (CSharp):

1. public void ReadString() {
2.   string s;
3. #if !UNITY_EDITOR && UNITY_METRO
4.   try {
5.     using (Stream stream = OpenFileForRead(ApplicationData.Current.RoamingFolder.Path, "filename.txt")) {
6.       byte[] data = new byte[stream.Length];
7.       stream.Read(data, 0, data.Length);
8.       s = Encoding.ASCII.GetString(data);
9.     }
10.   }
11.   catch (Exception e) {
12.     Debug.Log(e);
13.   }
14. #endif
15.   return s;
16. }
17.  
18. private static Stream OpenFileForRead(string folderName, string fileName) {
19.   Stream stream = null;
20. #if !UNITY_EDITOR && UNITY_METRO
21.   Task task = new Task(
22.     async () => {
23.       StorageFolder folder = await StorageFolder.GetFolderFromPathAsync(folderName);
24.       StorageFile file = await folder.GetFileAsync(fileName);
25.       stream = await file.OpenStreamForReadAsync();
26.     });
27.   task.Start();
28.   task.Wait();
29. #endif
30.   return stream;
31. }

I can't seem to build this with the OpenStreamForReadAsync().

 

does it work on the hololens?