title: Visual Studio: Missing assembly reference to "Windows"
body: <p>I'm trying to run the sample code found here, in C#:</p>
  
  <p><a href="https://code.msdn.microsoft.com/Sending-toast-notifications-71e230a2/sourcecode?fileId=51046&amp;pathId=1435720579" rel="nofollow noreferrer">https://code.msdn.microsoft.com/Sending-toast-notifications-71e230a2/sourcecode?fileId=51046&amp;pathId=1435720579</a></p>
  
  <p>When opened in Microsoft Visual Studio, it is missing a reference to something simply called "Windows". Not "System.Windows", not "WindowsBase", but just simply "Windows".</p>
  
  <p>Searching for NuGet packages within Visual Studio, or online, have proven fruitless, possibly because the result is indistinguishable from anything that mentions "Windows", which is one heck of a bunch of possible references (including, for example, "System.Windows").</p>
  
  <p>The package also needs a couple of WindowsAPICodePack references that I found through NuGet, so they are not the problem. It's just this mysterious "Windows" reference that I'm missing, which is not available from within Visual Studio by "Add reference...", and I can't find online or in NuGet.</p>