Unable to publish unpackaged WinUI3 application

[daltzctr]

Describe the bug

Attempting to publish an unpackaged MAUI application with 1.6 WASDK and .NET 9 results in the following obscure error message:

WindowsAppSDKSelfContained requires a supported Windows architecture.

The command I'm using to publish is linked below.

dotnet publish myapp.csproj -c Release -f net9.0-windows10.0.19041.0 -p:WindowsPackageType=None -p:SelfContained=true -p:WindowsAppSDKSelfContained=true -p:RuntimeIdentifierOverride=win-x64

Steps to reproduce the bug

I can't reproduce this out of the box, but I have no idea where to look at building a repro for this.

Expected behavior

Compiles

Screenshots

No response

NuGet package version

None

Packaging type

Unpackaged

Windows version

No response

IDE

Other

Additional context

Windows App SDK version: 1.6.240923002

[manodasanW]

To confirm, does your project set RuntimeIdentifier based on RuntimeIdentifierOverride?

[daltzctr]

Specifying an explicit RID with -p:RuntimeIdentifier=win-x64 gets me a bit further with new errors.

Unable to find package Microsoft.NETCore.App.Runtime.Mono.win-x64 with version (= 9.0.0)
    - Found 102 version(s) in nuget.org [ Nearest version: 9.0.0-preview.7.24405.7 ]
    - Found 102 version(s) in NuGet official package source [ Nearest version: 9.0.0-preview.7.24405.7 ]
    - Found 0 version(s) in Microsoft Visual Studio Offline Packages
    - Found 0 version(s) in C:\Program Files\dotnet\library-packs

[char8t]

For me it does work to publish an unpackaged WinUI3 app only when -p:WindowsPackageType=None is not set.
My .csproj looks like this:

<Project Sdk="Microsoft.NET.Sdk">

	<PropertyGroup>
		<OutputType>WinExe</OutputType>
		<TargetFramework>net9.0-windows10.0.19041.0</TargetFramework>
		<ApplicationManifest>app.manifest</ApplicationManifest>
		<Platforms>x64</Platforms>
		<RuntimeIdentifiers>win-x64</RuntimeIdentifiers>
		<ImplicitUsings>true</ImplicitUsings>
		<Nullable>enable</Nullable>
		<UseWinUI>true</UseWinUI>
		<EnableMsixTooling>true</EnableMsixTooling>
		<WindowsAppSDKSelfContained>true</WindowsAppSDKSelfContained>
		<SelfContained>true</SelfContained>
	</PropertyGroup>

	<ItemGroup>
		<PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.26100.1742" />
		<PackageReference Include="Microsoft.WindowsAppSDK" Version="1.6.241114003" />
	</ItemGroup>

</Project>

With this i can publish my app with simply doing dotnet publish .\FooApp.csproj -r win-x64 -o publish.

[char8t]

@daltzctr For your Unable to find package Microsoft.NETCore.App.Runtime.Mono.win-x64 with version (= 9.0.0) error. The MonoVM desktop packages are not available anymore starting with .NET 9 Preview 7: https://learn.microsoft.com/en-us/dotnet/core/compatibility/deployment/9.0/monovm-packages