Setup solution

ModernKeePassLib/Utility/StreamExtensions.cs

@@ -0,0 +1,17 @@
+using System.IO;
+using Windows.Storage.Streams;
+
+namespace ModernKeePassLibPCL.Utility
+{
+    public static class StreamExtensions
+    {
+        public static Stream AsStream(this IRandomAccessStream inputStream)
+        {
+            var reader = new DataReader(inputStream.GetInputStreamAt(0));
+            var bytes = new byte[inputStream.Size];
+            reader.LoadAsync((uint)inputStream.Size).GetResults();
+            reader.ReadBytes(bytes);
+            return new MemoryStream(bytes);
+        }
+    }
+}