title: Error NETSDK1100: Windows is required to build Windows desktop applications
body: <p>I am new in C#, in Visual Studio for Mac, and I need to open a project which extension is &quot;.sln&quot;.</p>
  <p>When I try to do it, a message is displayed:</p>
  <pre><code>error NETSDK1100: Windows is required to build Windows desktop applications.
  Unable to create package spec for project.
  </code></pre>
  <p>I think I can manage to open some files to modify the code and make it acceptable for Mac, but I don't know where to start searching.</p>