You click a photo, open Settings, or select the Start button, and a small window titled “explorer.exe” appears with the words “Class not registered.” When Windows 10 explorer class not registered error dewaasia interrupts everyday tasks, the item you wanted never opens.
The message means Windows tried to start a component using a registration entry that is missing or broken. File associations for modern apps, such as Photos or Edge, are a frequent source.
Updates, uninstalling a default app, or cleanup tools can damage those registrations.
Resetting default apps and repairing the affected app fixes most cases.
The error is easy to dismiss, but it usually comes back the next time you try the same action, so it is worth fixing properly.
What Might Be Causing It
The error appears for these reasons:
- The default app for a file type, such as JPG pictures, was removed or damaged.
- A built-in app, such as Photos or Edge, has a broken registration.
- System files related to the Windows shell are corrupted.
- Third-party software changed file associations or shell components.
Noting what you clicked when the error appeared is important, because it shows which app is affected.
The problem became common after some Windows 10 updates changed how default apps were handled, especially for photos and web links.
First Steps to Try
Reset default apps.
- Open Settings > Apps > Default apps.
- Scroll down and select Reset under “Reset to the Microsoft recommended defaults.”
- Choose your preferred apps again, such as the photo viewer and web browser.
- Restart Windows Explorer from Task Manager.
- Try opening the item again.
If the error happened when opening pictures, right-click an image, choose Open with, and select Photos with “Always use this app” ticked.
If the Problem Continues
Repair apps and system files.
- Open Settings > Apps, select the affected app, choose Advanced options, and select Repair, then Reset if needed.
- Update the app from the Microsoft Store.
- Run sfc /scannow in an administrator Command Prompt.
- Run DISM /Online /Cleanup-Image /RestoreHealth and restart.
- Test in a new user account to see whether the problem is profile-specific.
For Edge-related errors, repairing Edge through Settings > Apps > Microsoft Edge > Modify often resolves it.
If the error appears when opening the Start menu or Settings, the problem involves Windows’ built-in apps rather than a third-party program.
Protect Your Data First
Resetting an app clears its settings and stored data, so try Repair first. Note your preferred default apps before resetting them.
The Bottom Line
“Class not registered” means a broken app registration. Reset default apps, repair the affected app, and run system file checks.
If you use iCloud for Windows or another tool that integrates with File Explorer, update it too, since outdated integrations can also produce this message.