8 files declare their use of BinaryFileResponse in Zircon Profile 8

BinaryFileResponseTest.php in vendor/symfony/http-foundation/Tests/BinaryFileResponseTest.php

DiactorosFactory.php in vendor/symfony/psr-http-message-bridge/Factory/DiactorosFactory.php

DiactorosFactoryTest.php in vendor/symfony/psr-http-message-bridge/Tests/Factory/DiactorosFactoryTest.php

ExportForm.php in core/modules/locale/src/Form/ExportForm.php

Contains \Drupal\locale\Form\ExportForm.

FileDownloadController.php in core/modules/system/src/FileDownloadController.php

Contains \Drupal\system\FileDownloadController.

ImageStyleDownloadController.php in core/modules/image/src/Controller/ImageStyleDownloadController.php

Contains \Drupal\image\Controller\ImageStyleDownloadController.

PageCache.php in core/modules/page_cache/src/StackMiddleware/PageCache.php

Contains \Drupal\page_cache\StackMiddleware\PageCache.

UpdateTestController.php in core/modules/update/tests/modules/update_test/src/Controller/UpdateTestController.php

Contains \Drupal\update_test\Controller\UpdateTestController.