title: C# UWP Windows 10 Inter Process Communication with MemoryMappedFiles missing
body: <p>I'm facing a new problem, that occured while coding my IPC for my app.</p>
  
  <p>Before UWP I was able to use the directive <code>using System.IO.MemoryMappedFiles;</code> sucessfully. Now I can't use <code>using System.IO.MemoryMappedFiles;</code> and I need it.</p>
  
  <p>Is everyone facing the same issue? If yes, how do you solved it?</p>
  
  <p>My app doesn't compile anymore.</p>
  
  <p>I already tried to reimport the System.Core.dll as a reference and with DllImport, neither worked.</p>