TYPO3 Core

Currenty 'fileinfo' is listed as required php extension in SystemEnvironment/Check
but it is currently not really required and prevents from installing TYPO3 on Systems where it is not present (e.g. Mircosoft Azure Cloud)

The class is currently only used once in the core in "TYPO3\CMS\Core\Type\File\FileInfo" and only when it exists, so it is not really a hard dependency.

Also grepping on an installation folder does not find any match where \finfo is really required.