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Fix a file that will not open

We'll check file association, confirm the right app is installed, fix permissions, and help you open the file or recover it.

Troubleshooting · Home maintenance
5–15 min
What you'll need
  • The file that will not open
  • An app that can open that file type (install if missing)
Step 1 of 6

Quick triage — pick your path

Quick triage — pick your path

Choose the option that matches what you see. You can jump straight to that section.

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Steps

Goal: Confirm the file type, fix association or permissions, and open the file.

  • Check the file extension and confirm an app that can open it is installed.
  • Right-click the file and use “Open with” to pick a different app. If it opens, set that app as default.
  • If you see “access denied” or “file in use,” close other apps and check read permission.
  • Open the application first, then use File > Open to open the file from within the app.
  • Good: The file opens in the correct app. Bad: Still will not open—check Fix a file that is corrupted or reinstall the app.

Fix association

Goal: Set the correct app to open this file type when you double-click.

  • Right-click the file > Open with > Choose another app (Windows) or Open With (macOS).
  • Select the correct app and check “Always use this app” (Windows) or use “Change All” (macOS) to apply to all files of this type.
  • Double-click the file again. You should see it open in the correct app.

Check permissions

Goal: Ensure you have read access and the file is not locked.

  • Close any program that might have the file open (editors, viewers, backup tools).
  • Right-click the file > Properties > Security (Windows) or Get Info > Sharing & Permissions (macOS).
  • Confirm your account has Read access. Add your account or take ownership if needed.
  • Try opening the file again. You should see it open or a different error.

Check corruption

Goal: Determine if the file is corrupted or in the wrong format.

  • Open the app that should handle this file type. Use File > Open and browse to the file.
  • If the file opens but shows garbage or wrong content, it may be corrupted. See Fix a file that is corrupted.
  • If the file will not open from within the app either, the file may be damaged or in an unsupported format.

When to get help

  • The file is from work or a vendor and requires special software—contact the source for the correct viewer.
  • The file opens but content is unreadable—see Fix a file that is corrupted.
  • You have fixed association, permissions, and app but the file still will not open—the file may be corrupted or in a proprietary format.

Verification

  • Double-clicking the file opens it in the correct app.
  • No “access denied” or “file in use” errors.
  • The file content displays correctly.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Check file type and app Confirm the extension and that an app that can open it is installed.
  2. Fix association Use "Open with" to pick the correct app and set it as default.
  3. Check permissions and locks Verify read permission and that no other program has the file open.
  4. Open from within app Launch the app and use File > Open to open the file.
  5. Repair or reinstall app Repair or reinstall the application that should open the file.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • File name and extension
  • Error message when opening
  • Default app for that file type
  • Whether the file opens from within the app

Does double-clicking the file do nothing or open the wrong app?

File association or missing app often causes this. Check the file extension and default app.

Check the file extension. Right-click the file and choose "Open with." Good: You can pick an app and the file opens. Bad: No app in the list can open it—install one or the file may be corrupted.

Yes No (different problem)

You can change your answer later.

Can you open the file with "Open with" and pick the correct app?

If yes, set that app as default for this file type.

Right-click > Open with > Choose another app. Pick the correct app and check "Always use this app" (Windows) or "Change All" (macOS). Good: File opens and default is set. Bad: File still will not open—check permissions or corruption.

Yes No

You can change your answer later.

Set default and test

Set the app as default for this file type. Double-click the file again. It should open in the correct app.

Done

Do you see "access denied," "permission denied," or "file in use"?

Permission or lock issues prevent opening.

Close any app that might have the file open. Right-click the file > Properties > Security. Confirm your account has Read access. Good: Permission fixed, file opens. Bad: Still denied—check if file is on a restricted drive or network share.

Yes No

You can change your answer later.

Fix permission and test

Add your account to the file permissions with Read access. Take ownership if needed (Windows: Advanced > Owner). Try opening again.

Done

Does the file open but show garbage or wrong content?

Corruption or wrong format. See fix-file-is-corrupted.

The file may be corrupted or mislabeled. Try opening from within the app (File > Open). If it still fails, see Fix a file that is corrupted for recovery steps.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a file not open when I double-click it?
Common causes: no app associated with the file type, the wrong app is set as default, the file is corrupted, or another program has it locked. Check "Open with" and file associations first.
How do I change which program opens a file type?
Right-click the file, choose "Open with" > "Choose another app" (Windows) or "Open With" (macOS). Select the app and check "Always use this app" to set the default.
What if the file says "access denied" or "permission denied"?
You may not have read permission. Right-click the file, choose Properties > Security, and confirm your account has Read access. If the file is on a network drive, check share permissions.

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