Setting the regkey in HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\App Paths\Notepad from the original ms store version's path to "c:\windows\system32\notepad.exe" solved it for me too.
Notepad fails to launch from Win+R ("notepad") due to missing Microsoft.UI.Windowing.Core.dll (Windows 11 Insider Dev 25H2 build 26220.7052)
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(137.6, 34%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EN%3C/text%3E%3C/svg%3E)
Nova
20
Reputation points
Hi,
When I press Win + R, type notepad, and hit Enter, I get this error message:
The code execution cannot proceed because Microsoft.UI.Windowing.Core.dll was not found. Reinstalling the program may fix this problem.
However:
Running C:\Windows\notepad.exe directly works perfectly.
Opening Notepad from the Start menu also works fine.
The problem only happens when launching Notepad via Win + R (or the notepad command).
This makes me think the modern UWP version of Notepad (WinUI 3) is missing a dependency or has a broken link to the Windows App SDK, while the legacy executable still works.
Steps I have tried:
Reinstalled Notepad using:
dism /online /add-capability /capabilityname:Microsoft.Windows.Notepad~~~~0.0.1.0
- Ran:
sfc /scannow DISM /Online /Cleanup-Image /RestoreHealth
None of these solved the issue.
Could you please confirm if this is a known issue in the Dev Channel build 26220.7052, or provide guidance on how to reinstall or restore the missing Microsoft.UI.Windowing.Core.dll / Windows App SDK runtime?
System Info:
Edition: Windows 11 Insider Preview 25H2 (Build 26220.7052)
Channel: Dev
Architecture: x64
Notepad version: UWP (Microsoft Store)
Thanks a lot for your help!
Windows Insider program | Windows Insider preview | Other
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Nova 20 Reputation points
2025-11-10T15:55:12.86+00:00 Thanks for the answer, but how can I reinstall Windows App SDK? I don't know how to reinstall it?
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(57.599999999999994, 18%, 15%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDM%3C/text%3E%3C/svg%3E)
Dragon Mc Fly 20 Reputation points2025-12-05T16:19:43.9666667+00:00 I had the same problem and the only thing that solved the problem was delete notepad at
Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\App Paths
(see: https://www.reddit.com/r/techsupport/comments/143v4gy/cant_launch_notepad_from_the_run_prompt/) -
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(73.60000000000001, 11%, 17%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMV%3C/text%3E%3C/svg%3E)
Marcel van den Bosch 0 Reputation points2026-02-13T09:37:59.8266667+00:00 The solution mentioned by Dragon Mc Fly worked for me!
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Sándor Gordon Lipcsei 0 Reputation points2026-04-26T09:26:06.1633333+00:00 -
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(12.8, 94%, 11%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESK%3C/text%3E%3C/svg%3E)
Stephan Kuebler 0 Reputation points2026-04-26T19:42:05.4133333+00:00 26.04.2026 - I have same Problem. tried SFC, Dism, Reinstall, Changeing Registry. Nothing Helps. Strangely when i check the "App Setting" it say |Version = 11.2512.29.0 |App = 0 Bytes |Data = 40.0KB |TotalUsed = 40.0 KB ??? A 0 Byte App that has 40KB ???
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Stephan Kuebler 0 Reputation points
2026-04-26T19:48:23.91+00:00 26.04.2026 - I have same Problem. tried SFC, Dism, Reinstall, Changeing Registry. Nothing Helps. Strangely when i check the "App Setting" it say |Version = 11.2512.29.0 |App = 0 Bytes |Data = 40.0KB |TotalUsed = 40.0 KB ??? A 0 Byte App that has 40KB ???