title: How to build XLL with Excel-DNA
body: <p>I am trying to follow the simplest example at the Excel-DNA.net front page to create a simplest UDF for Excel. My code builds correctly, except it builds into dll instead of xll. How do I build it into an xll file?</p>
  
  <p>I literally follow the example from the page (copy pasting it here)</p>
  
  <ol>
  <li>Create a new Class Library (.NET Framework) project in Visual Basic, C# or F#.</li>
  <li>Use the Manage NuGet Packages dialog or the Package Manager Console to install the Excel-DNA package:
  PM> Install-Package ExcelDna.AddIn</li>
  <li>Add your code (C#, Visual Basic.NET or F#):</li>
  </ol>
  
  <p>using ExcelDna.Integration;</p>
  
  <p>public static class MyFunctions
  {
      [ExcelFunction(Description = "My first .NET function")]
      public static string SayHello(string name)
      {
          return "Hello " + name;
      }
  }</p>
  
  <ol start="4">
  <li>Compile, load and use your function in Excel:</li>
  </ol>
  
  <p>=SayHello("World!")</p>
  
  <p>All is fine, except it builds into DLL...</p>