title: NETSDK1135 SupportedOSPlatformVersion 10.0.19041.0 cannot be higher than TargetPlatformVersion 7.0
body: <p>I am trying to convert a .NET Framework WPF app to .NET 5</p>
  <p>I ran <a href="https://github.com/dotnet/try-convert" rel="noreferrer">https://github.com/dotnet/try-convert</a>, and removed some incompatible DLL refs.</p>
  <p>Now, when I try to compile, I am presented with</p>
  <pre><code>NETSDK1135  SupportedOSPlatformVersion 10.0.19041.0 cannot be higher than TargetPlatformVersion 7.0
  </code></pre>
  <p><a href="https://i.stack.imgur.com/fS7FD.png" rel="noreferrer"><img src="https://i.stack.imgur.com/fS7FD.png" alt="enter image description here" /></a></p>
  <p>Any ideas as to what to look for?
  The project in question is a combination of .NET 5 and .NET Standard 2.1</p>