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If you don’t have permission to open a file or folder on Mac
If you don’t have permission to open a file or folder, you may be able to change the permissions settings.
On your Mac, select the item, then choose File > Get Info or press Command-I.
Click the disclosure triangle next to Sharing & Permissions to expand the section.
Click the pop-up menu next to your username to see the permissions settings.
If you’re not logged in as an administrator, you may need to click the lock icon
and enter an administrator name and password.Change the permissions to either Read & Write or “Read only”.
If you can’t change the permissions, contact an administrator of your Mac or the owner of the file or folder.