Error APT0003 Invalid file name: It must contain only [^a-zA-Z0-9_.]+ for file OpenSans-Regular.ttf

Description

I have installed the last version of Visual Studio 2022 preview, 17.1.0 Preview 1.1, and I just created a MAUI project with the template of visual studio and then I try to compile it. I get the following error:

Error APT0003 Invalid file name: It must contain only [^a-zA-Z0-9_.]+ for file OpenSans-Regular.ttf

The project is in a folder which path has not blank spaces, neither another not allowed caracters. This is the complete path of the folder:

C:\proyectos\GestorOrdenadores\GestorOrdenadores.Cliente.XamarinMaui\Resources\Fonts

Thanks.

Steps to Reproduce

1.- Create a MAUI project witth Visual Studio 2022 template 2.- Compile MAUI project

Version with bug

Preview 11

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

Andriod

Did you find any workaround?

No response

Relevant log output

Operación Recompilar iniciada...
Se ha restaurado C:\proyectos\GestorOrdenadores\GestorOrdenadores.Service.Grpc.DotNet\GestorOrdenadores.Service.Grpc.DotNet.csproj (en 4,09 sec).
Se ha restaurado C:\proyectos\GestorOrdenadores\GestorOrdenadores.Cliente.Wpf\GestorOrdenadores.Cliente.Wpf.csproj (en 4,1 sec).
Se ha restaurado C:\proyectos\GestorOrdenadores\GestorOrdenadores.Cliente\GestorOrdenadores.Cliente.csproj (en 4,09 sec).
Se ha restaurado C:\proyectos\GestorOrdenadores\GestorOrdenadores.Service.Comun\GestorOrdenadores.Service.Comun.csproj (en 4,12 sec).
1>------ Operación Recompilar todo iniciada: proyecto: GestorOrdenadores.Cliente.XamarinMaui, configuración: Debug Any CPU ------
Se ha restaurado C:\proyectos\GestorOrdenadores\GestorOrdenadores.Cliente.XamarinMaui\GestorOrdenadores.Cliente.XamarinMaui.csproj (en 4,77 sec).
1>Resources\Fonts\OpenSans-Regular.ttf : error APT0003: Invalid file name: It must contain only [^a-zA-Z0-9_.]+.
1>Compilación del proyecto "GestorOrdenadores.Cliente.XamarinMaui.csproj" terminada -- ERROR.
========== Recompilar todo: 0 correctos, 1 incorrectos, 0 omitidos ==========

[nextfool]

@MagicAndre1981 I have exactly the same issue with vs 2022 17.1 preview3. If I remove the ‘-’ from the file name (also removed from the code)

 builder
                .RegisterBlazorMauiWebView()
                .UseMauiApp<App>()
                .ConfigureFonts(fonts =>
                {
                    fonts.AddFont("OpenSansRegular.ttf", "OpenSansRegular");
                });

I have a whole bunch of new errors like:

Severity	Code	Description	Project	File	Line	Suppression State
Error	APT2144	invalid file path 'D:\projects\playground\IHostLearning\MauiApp2Blazor\obj\Debug\net6.0-android\res\resources\images\dotnet_bot.svg'.	MauiApp2Blazor	C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\31.0.200-preview.12.2\tools\Xamarin.Android.Aapt2.targets	123	
Error	APT2144	invalid file path 'D:\projects\playground\IHostLearning\MauiApp2Blazor\obj\Debug\net6.0-android\res\resources\appiconfg.svg'.	MauiApp2Blazor	C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\31.0.200-preview.12.2\tools\Xamarin.Android.Aapt2.targets	123	
Error	APT2144	invalid file path 'D:\projects\playground\IHostLearning\MauiApp2Blazor\obj\Debug\net6.0-android\res\resources\fonts\opensansregular.ttf'.	MauiApp2Blazor	C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\31.0.200-preview.12.2\tools\Xamarin.Android.Aapt2.targets	123	
Error	APT2144	invalid file path 'D:\projects\playground\IHostLearning\MauiApp2Blazor\obj\Debug\net6.0-android\res\resources\appicon.svg'.	MauiApp2Blazor	C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\31.0.200-preview.12.2\tools\Xamarin.Android.Aapt2.targets	123	

So something is definitely wrong here, please have a look @jfversluis . Thank you.

So the errors are fixed by steps in https://github.com/dotnet/maui/issues/3900

[jfversluis]

Hey @ComptonAlvaro thanks for the report!

The error is not about the path where your app is but the filename and if you look at that: OpenSans-Regular.ttf it has a hyphen (-) in there which is not allowed. Android in particular isn’t great at handling “special” characters in filenames, that’s why this safe guard is in place.

Rename that file to, for instance: OpenSansRegular.ttf and it should be fine.

If that doesn’t resolve it, please let me know!