I don't know some changes....

Wino.Mail/Extensions/MimeKitExtensions.cs

@@ -1,19 +0,0 @@
-using System.Threading.Tasks;
-using Windows.Storage;
-using Wino.Helpers;
-using Wino.Mail.ViewModels.Data;
-
-namespace Wino.Extensions
-{
-    public static class MimeKitExtensions
-    {
-        public static async Task<MailAttachmentViewModel> ToAttachmentViewModelAsync(this StorageFile storageFile)
-        {
-            if (storageFile == null) return null;
-
-            var bytes = await storageFile.ReadBytesAsync();
-
-            return new MailAttachmentViewModel(storageFile.Name, bytes);
-        }
-    }
-}