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Load file from OneDrive directory,but the ENABLE_WINMD_SURRPORT is always false

Hi
I'm trying to develop a unity application for hololens and I need to load a text file as a data source to visualize at runtime.
My toolchain:
-- Mixed Reality Toolkit v.2.0.0 RC1
-- Unity 2018.3.12f1 personal
-- Visual Studio Community 2017 (15..9.11)
-- HoloLens OS v.10.0.14393.2125
-- Windows 10 v.18362.53
--Win 10 SDK 10.0.17763.0
My Unity Player setting:
Scripting Runtime Version:.Net 4.x
Scripting Backend:IL2CPP
Api Compatibility Level:.NET 4.x

I use these code to access the fileOpenPicker component to load file,

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Threading;
using System.Threading.Tasks;
using System;
using UnityEngine.WSA;
using UnityEngine.UI;

if ENABLE_WINMD_SUPPORT

using Windows.Storage;
using Windows.Storage.Streams;
using Windows.Storage.Pickers;

endif

public class fileLoad : MonoBehaviour
{

if ENABLE_WINMD_SUPPORT

private FileOpenPicker openPicker;

endif

void Start()
{
    UnityEngine.Debug.LogFormat("UnityThread: {0}", Thread.CurrentThread.ManagedThreadId);

if ENABLE_WINMD_SUPPORT

    UnityEngine.WSA.Application.InvokeOnUIThread(OpenFileAsync, false);  

else

        UnityEngine.Debug.Log("ENABLE_WINMD_SUPPORT false");

endif

}

but the result was always "ENABLE_WINMD_SUPPORT false".
What can I do?

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