Application Not Found When Opening Folders in Windows
If you're getting an “Application not found” error when trying to open folders on Windows (double-clicking a folder does nothing or shows an error), it's likely due to a broken folder association or registry issue.
I recently ran into this and finally resolved it using a simple registry fix. Here is how to fix.
Solution: Restore Folder Association via Registry
You can fix the issue by resetting folder open behavior in the Windows Registry.
Back up first: create a restore point (search for Create a restore point in the Start menu) before changing the registry, so you can undo the change if anything goes wrong.
Steps:
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Open Notepad.
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Paste the following text:
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\Directory\shell]
@="none"
[HKEY_CLASSES_ROOT\Folder\shell]
@="none"
[HKEY_CLASSES_ROOT\Drive\shell]
@="none"
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Save the file as:
fix_folders.reg
(Make sure to choose “All Files” under "Save as type")
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Right-click the file and choose Merge.
This registry fix resets the default shell behavior for folders, drives, and directories-restoring proper association with explorer.exe, the default file manager for Windows
Frequently Asked Questions (FAQ)
What causes Application not found when opening a folder?
Usually the default action for folders in the registry has been changed, often by a program that made itself the folder handler or was uninstalled badly.
Is editing the registry safe?
Only with care. Create a restore point or export the keys first, and change only the keys the guide names.
How do I undo the registry change?
Use the restore point you created, or double-click the .reg backup you exported before making the change.
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