Windows app asking for splash screen on installation of app Win 11 and Win 10

[MarianHristov92]

Description

There is an issue with the publishing of release version for Windows apps. After you publish the app and try to install it at the 99% of the installation you receive:
App installation failed with error message: AppxManifest.xml(34,27): error 0x80070002: Cannot install or update package MauiApp1_k78q5atfj1762 because the splash screen image [splashSplashScreen.png] cannot be located. Verify that the package contains an image that can be used as a splash screen for the application, and that the package manifest points to the correct location in the package where this splash screen image can be found. (0x80070002)

By default the WinUI apps shouldn't have Splash screens even though it requires one.
Tried with clean, rebuild, delete of bin/obj files, restarting of the VS, machine restarting but the result remains the same.

Steps to Reproduce

1. Unzip the attached file
2. Build the project with Release | Any CPU
3. Open command prompt
4. Go to the project location where the .csproj file is located
5. Write dotnet publish MauiApp1.csproj -f net9.0-windows10.0.19041.0 -c Release
6. Wait for it to be build
7. Go to the location inside of the project: bin\Release\net9.0-windows10.0.19041.0\win10-x64\AppPackages and select the release build
8. Click on the MSIX
9. If you don't have authorization follow this guide to obtain trust in the certificate:
   https://beebom.com/how-fix-publisher-could-not-be-verified-error-windows-11/
10. Click on MSIX file again after you enable the authorization

PS. Attached is .cer file:
Account: M1
Password: Test1234

MauiApp1.zip

Link to public reproduction project repository

No response

Version with bug

9.0.30 SR3

Is this a regression from previous behavior?

Yes, this used to work in Xamarin.Forms

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

windows10.0.19041.0 and above

Did you find any workaround?

No response

Relevant log output

[jfversluis]

It looks like you have an old version of the templates because you state that this is .NET 9 and the csproj has .NET 9 but the MainPage shows the .NET 8 bot. For a brief while we had some transition thing for the Windows splash screen indeed, maybe thats what you're still seeing here?

If you do dotnet new uninstall does that give you something? If you do dotnet new update does that update the template for you and give you the hover bot instead of the race car bot and does that resolve it?

[MarianHristov92]

Ok, after some checks I made a new .Net 9 project and that seems to not be having this issues. However when I upgrade from .NET 8 to .NET 9 I continue to have this issue. Is there some additional manual for transitioning since I check the transition link you have sent me and it does seem that I have done all of these already.

[RoiChen001]

This problem cannot be reproduced on the latest 17.13 preview 2.1(9.0.30).

[MarianHristov92]

I fixed it using the following steps:

1. Close the project and delete Bin/obj files
2. Updated to the latest version (9.0.30)
3. In the item group where is your spash screen and icons add:
   <MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
4. Add this property group:
   <PropertyGroup Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows' and '$(Configuration)' == 'Release'"> <PackageCertificateThumbprint>YourCertificateCodeThatYouGetWhenYouMakeCertificate</PackageCertificateThumbprint> <AppxPackageSigningEnabled>True</AppxPackageSigningEnabled> </PropertyGroup>
5. Rebuild project and publish a new version
6. Worked