Compatibility Issues with WPF App (.NET Framework) on Windows 11

Question

1. The application I previously built using WPF App (.NET Framework) runs well on Windows 10 (.NET Framework 4.8). However, it does not run on Windows 11 (the app does not start).
2. In Visual Studio, I created a new project using WPF App (.NET Framework). Without adding or modifying any source code, I built and ran the project. The app crashed similarly to point 1.

Both 1 and 2 report errors in Event Viewer > Application. The error is related to ucrtbase.dll.

I have updated Windows, updated Visual Studio, and tried running the application on a different PC, but the error persists.

Could it be that Windows 11 is not compatible with WPF App (.NET Framework)?

Answer 1

Hi @FixBug , WPF applications built using .NET Framework, including version 4.8, should generally run without issues on Windows 11, as Windows 11 is designed to be backward-compatible with apps developed on the .NET Framework. The error you're encountering with ucrtbase.dll (Universal C Runtime) likely indicates that the issue is related to the runtime environment rather than Windows 11's compatibility with WPF itself.

Try to reinstall the Universal C Runtime:

1.- Open Windows Settings

2.- Navigate to Apps > Installed Apps

3.- Locate the following:

• Microsoft Visual C++ 20XX Redistributable - x64 <version>

• Microsoft Visual C++ 20XX Redistributable - x86 <version>

4.- Uninstall

5.- Download & Install the latest C++ Redistributables from the Official Website: Latest supported Visual C++ Redistributable downloads | Microsoft Learn

6.- Reboot

Best Regards.

Jiachen Li

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Answer 2

Hi @Jiachen Li-MSFT

I have identified the cause of the error.

The reason is that my source code uses a namespace in Japanese.

When I changed the namespace to English, the program ran normally.

For example:

namespace 新しい名前空間 {//source code}

Changed to:

namespace NewNamespace {//source code}

It seems there is some issue with Windows 11 causing this error.
The Windows 10 and 11 versions I am using are in Japanese.
However, Windows 10 does not have the error, while Windows 11 does.

What do you think?