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The Fileinfo PECL package has been superseded, but is still maintained for bugs and security fixes. Indeed the fileinfo extension has been moved to php sources [php-src/ext/fileinfo https://pecl.php.net/package/php-src/ext/fileinfo] since 5.3.0: you should enable it, since it should be already installed by default with your PHP installation. Look for more specific details for your OS environment and/or contact your Hosting Provider.