[UWP] Process.MainWindowTitle is empty in 25H2

As described in previous message the scenario means checking the MainWindowTitle of the process but not Title while running in the same UWP app.

1. Launch UWP app
2. Launch some another full trust process
3. In the FT process find the process and check the MainWindowTitle

var processes = Process.GetProcessesByName(processName);

foreach (var process in processes)
{
	var title = process.MainWindowTitle;
}

On my 25H2 machine I do get a non‑empty MainWindowTitle for the ApplicationFrameHost instance that hosts my test UWP app (e.g. "My UWP App Title - test"). So 25H2 itself doesn’t universally force MainWindowTitle to be empty for UWP windows.

I read on the MainWindowTitle documentation and it seems to be heuristic and not guaranteed:

• The .NET docs say it depends on MainWindowHandle and that this can be zero if the process has no main window, or if it hasn’t been created yet Process.MainWindowTitle Property
• The MainWindowHandle property is just a guess based on heuristics

Because of that, whether Process.MainWindowTitle is empty or not can vary depending on:

• How your specific UWP app configures its window (caption, styles, custom title bar, multiple views, etc.).
• Exactly when you query it (if you do it very early, the main window may not be created yet).
• Internal changes in how ApplicationFrameHost hosts UWP windows.

If you need a more reliable way to get the window caption from outside the app, you could try Win32 window enumeration (EnumWindows → GetWindowThreadProcessId → GetWindowText) or UI Automation, rather than relying solely on Process.MainWindowTitle. Note that GetWindowText works for top-level window titles in other processes, but not for child controls’ text.

Hi, is there any update on this?

Still the same. Again, it worked well, but after Windows update it stopped to work. I will try other ways to find it.