admin/environment/php extension/fileinfo
From MoodleDocs
This package has been superseded, but is still maintained for bugs and security fixes. Package has moved to channel php-src/ext/fileinfo, package in php sources.
Note: You are currently viewing documentation for Moodle 3.3. Up-to-date documentation for the latest stable version of Moodle is probably available here: admin/environment/php extension/fileinfo.
This package has been superseded, but is still maintained for bugs and security fixes. Package has moved to channel php-src/ext/fileinfo, package in php sources.