I don't know some changes....

Wino.Mail/Helpers/SettingsStorageExtensions.cs

@@ -1,31 +0,0 @@
-using System;
-using System.Threading.Tasks;
-using Windows.Storage;
-using Windows.Storage.Streams;
-
-namespace Wino.Helpers
-{
-    // Use these extension methods to store and retrieve local and roaming app data
-    // More details regarding storing and retrieving app data at https://docs.microsoft.com/windows/uwp/app-settings/store-and-retrieve-app-data
-    public static class SettingsStorageExtensions
-    {
-        public static async Task<byte[]> ReadBytesAsync(this StorageFile file)
-        {
-            if (file != null)
-            {
-                using (IRandomAccessStream stream = await file.OpenReadAsync())
-                {
-                    using (var reader = new DataReader(stream.GetInputStreamAt(0)))
-                    {
-                        await reader.LoadAsync((uint)stream.Size);
-                        var bytes = new byte[stream.Size];
-                        reader.ReadBytes(bytes);
-                        return bytes;
-                    }
-                }
-            }
-
-            return null;
-        }
-    }
-}