**Following works as expected:**
VS Studio 2019 tested with professional and community.

* Create new APF App (.NET Framework)
* Open properties Folder
* Change Resources.resx to public
* Create a new resources file (Resources.de.resx)
* Build

Compiles as expected

**Following does not work:**

* Create new APF App (.NET Core)
* Create a Resources Folder
* Create a new resources file (Resources.resx)
* Change it to public
* Create a new resources file (Resources.de.resx)
* Build

Tested it on 3 different machines with VS 2019 professional and community

Compile Errors:

> 
> Error Custom tool PublicResXFileCodeGenerator failed to produce an output for input file 'Resources\Resources.de.resx' but did not log a specific error. WpfApp4 C:...\source\repos\WpfApp4\WpfApp4\Resources\Resources.de.resx 1
> 
> 
> Error MSB3086 Task could not find "al.exe" using the SdkToolsPath "" or the registry key "HKEY\_LOCAL\_MACHINE\SOFTWARE\Microsoft\Microsoft SDKs\NETFXSDK\4.7.2\WinSDK-NetFx40Tools-x86". Make sure the SdkToolsPath is set and the tool exists in the correct processor specific location under the SdkToolsPath and that the Microsoft Windows SDK is installed WpfApp4 C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\MSBuild\Current\Bin\Microsoft.Common.CurrentVersion.targets 3639
> 
> 
> 

EDIT: Also created a Ticket at Microsoft

<https://developercommunity.visualstudio.com/content/problem/771961/compile-error-with-wpf-net-core-30-when-adding-res.html>