@steveisok I don't know if you need to actually run the AOT compiler on Windows, we just need to make sure these aren't imported because they are not installed on Windows:

runtime/src/mono/nuget/Microsoft.NET.Workload.Mono.Toolchain.Manifest/WorkloadManifest.targets

Lines 23 to 25 in 685eda6

    
           <Import Project="Sdk.props" Sdk="Microsoft.NETCore.App.Runtime.AOT.Cross.ios-arm" /> 
        
           <Import Project="Sdk.props" Sdk="Microsoft.NETCore.App.Runtime.AOT.Cross.ios-arm64" /> 
        
           <Import Project="Sdk.props" Sdk="Microsoft.NETCore.App.Runtime.AOT.Cross.iossimulator" />

(there might be more packs than this, too)

The errors you get when building iOS or MacCatalyst on Windows are:

C:\src\maui\bin\dotnet\sdk-manifests\6.0.100\microsoft.net.workload.mono.toolchain\WorkloadManifest.targets(23,9): error : C:\src\maui\bin\dotnet\sdk\6.0.100-preview.6.21328.1\Sdks\Microsoft.NETCore.App.Runtime.AOT.Cross.ios-arm\Sdk not found. Check that a recent enough .NET SDK is installed and/or increase the version specified in global.json.
C:\src\maui\bin\dotnet\sdk-manifests\6.0.100\microsoft.net.workload.mono.toolchain\WorkloadManifest.targets(24,9): error : C:\src\maui\bin\dotnet\sdk\6.0.100-preview.6.21328.1\Sdks\Microsoft.NETCore.App.Runtime.AOT.Cross.ios-arm64\Sdk not found. Check that a recent enough .NET SDK is installed and/or increase the version specified in global.json.
C:\src\maui\bin\dotnet\sdk-manifests\6.0.100\microsoft.net.workload.mono.toolchain\WorkloadManifest.targets(29,9): error : C:\src\maui\bin\dotnet\sdk\6.0.100-preview.6.21328.1\Sdks\Microsoft.NETCore.App.Runtime.AOT.Cross.maccatalyst\Sdk not found. Check that a recent enough .NET SDK is installed and/or increase the version specified in global.json.

iOS has an "offline" build on Windows that just compiles your C# code against reference assemblies. You have to use a Mac build host to do a full build with AOT.

	<Import Project="Sdk.props" Sdk="Microsoft.NETCore.App.Runtime.AOT.Cross.ios-arm" />
	<Import Project="Sdk.props" Sdk="Microsoft.NETCore.App.Runtime.AOT.Cross.ios-arm64" />
	<Import Project="Sdk.props" Sdk="Microsoft.NETCore.App.Runtime.AOT.Cross.iossimulator" />

[Mono] Make sure the iOS and MacCatalyst AOT workload packs are not imported on Windows #54944

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