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NETSDK1100: Set the EnableWindowsTargeting property to true

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NETSDK1100 indicates that you're building a project that targets Windows on Linux or macOS. The full error message is similar to the following example:

To build a project targeting Windows on this operating system, set the EnableWindowsTargeting property to true.

To resolve this error, set the EnableWindowsTargeting property to true. You can set it in the project file or by passing /p:EnableWindowsTargeting=true to a .NET CLI command, such as dotnet build. Here's an example project file:

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net6.0</TargetFramework>
    <EnableWindowsTargeting>true</EnableWindowsTargeting>
  </PropertyGroup>
</Project>

If you want to apply this setting to your whole solution or repository, you can set it in a Directory.Build.props file.

By default, .NET downloads all targeting packs (and runtime packs for self-contained builds) for the current target framework whether they're needed or not, because they might be brought in by a transitive framework reference. We didn't want to ship the Windows targeting packs with the non-Windows SDK builds, but we also didn't want a vanilla Console or ASP.NET Core app to automatically download these targeting and runtime packs the first time you build. The EnableWindowsTargeting property enables them to be downloaded only if you opt in.

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