diff --git a/apps/files_sharing/api/local.php b/apps/files_sharing/api/local.php
index aaafafb269..5b2f2e06e7 100644
--- a/apps/files_sharing/api/local.php
+++ b/apps/files_sharing/api/local.php
@@ -64,9 +64,10 @@ class Local {
 		if ($shares === false) {
 			return new \OC_OCS_Result(null, 404, 'could not get shares');
 		} else {
+			$mimetypeDetector = \OC::$server->getMimeTypeDetector();
 			foreach ($shares as &$share) {
 				if ($share['item_type'] === 'file' && isset($share['path'])) {
-					$share['mimetype'] = \OC_Helper::getFileNameMimeType($share['path']);
+					$share['mimetype'] = $mimetypeDetector->detectPath($share['path']);
 					if (\OC::$server->getPreviewManager()->isMimeSupported($share['mimetype'])) {
 						$share['isPreviewAvailable'] = true;
 					}
@@ -227,9 +228,10 @@ class Local {
 	private static function getFilesSharedWithMe() {
 		try	{
 			$shares = \OCP\Share::getItemsSharedWith('file');
+			$mimetypeDetector = \OC::$server->getMimeTypeDetector();
 			foreach ($shares as &$share) {
 				if ($share['item_type'] === 'file') {
-					$share['mimetype'] = \OC_Helper::getFileNameMimeType($share['file_target']);
+					$share['mimetype'] = $mimetypeDetector->detectPath($share['file_target']);
 					if (\OC::$server->getPreviewManager()->isMimeSupported($share['mimetype'])) {
 						$share['isPreviewAvailable'] = true;
 					}
diff --git a/apps/files_trashbin/ajax/preview.php b/apps/files_trashbin/ajax/preview.php
index 49d6d93f57..ecb4971253 100644
--- a/apps/files_trashbin/ajax/preview.php
+++ b/apps/files_trashbin/ajax/preview.php
@@ -62,7 +62,7 @@ try{
 				$fileName = substr($fileName, 0, $i);
 			}
 		}
-		$mimetype = \OC_Helper::getFileNameMimeType($fileName);
+		$mimetype = \OC::$server->getMimeTypeDetector()->detectPath($fileName);
 	}
 	$preview->setMimetype($mimetype);
 	$preview->setMaxX($maxX);
diff --git a/apps/files_trashbin/lib/helper.php b/apps/files_trashbin/lib/helper.php
index d14e97285c..0ccf15cd2b 100644
--- a/apps/files_trashbin/lib/helper.php
+++ b/apps/files_trashbin/lib/helper.php
@@ -87,7 +87,7 @@ class Helper
 					$i = array(
 						'name' => $id,
 						'mtime' => $timestamp,
-						'mimetype' => $view->is_dir($dir . '/' . $entryName) ? 'httpd/unix-directory' : \OC_Helper::getFileNameMimeType($id),
+						'mimetype' => $view->is_dir($dir . '/' . $entryName) ? 'httpd/unix-directory' : \OC::$server->getMimeTypeDetector()->detectPath($id),
 						'type' => $view->is_dir($dir . '/' . $entryName) ? 'dir' : 'file',
 						'directory' => ($dir === '/') ? '' : $dir,
 						'size' => $size,
diff --git a/apps/files_versions/ajax/preview.php b/apps/files_versions/ajax/preview.php
index 0da518f3ea..f21911abc9 100644
--- a/apps/files_versions/ajax/preview.php
+++ b/apps/files_versions/ajax/preview.php
@@ -48,7 +48,7 @@ if($maxX === 0 || $maxY === 0) {
 try {
 	list($user, $file) = \OCA\Files_Versions\Storage::getUidAndFilename($file);
 	$preview = new \OC\Preview($user, 'files_versions', $file.'.v'.$version);
-	$mimetype = \OC_Helper::getFileNameMimeType($file);
+	$mimetype = \OC::$server->getMimeTypeDetector()->detectPath($file);
 	$preview->setMimetype($mimetype);
 	$preview->setMaxX($maxX);
 	$preview->setMaxY($maxY);
diff --git a/lib/private/files/objectstore/objectstorestorage.php b/lib/private/files/objectstore/objectstorestorage.php
index 5ec05a3529..a053ea6d6d 100644
--- a/lib/private/files/objectstore/objectstorestorage.php
+++ b/lib/private/files/objectstore/objectstorestorage.php
@@ -329,7 +329,7 @@ class ObjectStoreStorage extends \OC\Files\Storage\Common {
 			$stat['mtime'] = $mtime;
 			$this->getCache()->update($stat['fileid'], $stat);
 		} else {
-			$mimeType = \OC_Helper::getFileNameMimeType($path);
+			$mimeType = \OC::$server->getMimeTypeDetector()->detectPath($path);
 			// create new file
 			$stat = array(
 				'etag' => $this->getETag($path),
diff --git a/lib/private/files/storage/common.php b/lib/private/files/storage/common.php
index b06543d0a6..091f2edb62 100644
--- a/lib/private/files/storage/common.php
+++ b/lib/private/files/storage/common.php
@@ -225,7 +225,7 @@ abstract class Common implements Storage {
 		if ($this->is_dir($path)) {
 			return 'httpd/unix-directory';
 		} elseif ($this->file_exists($path)) {
-			return \OC_Helper::getFileNameMimeType($path);
+			return \OC::$server->getMimeTypeDetector()->detectPath($path);
 		} else {
 			return false;
 		}
diff --git a/lib/private/helper.php b/lib/private/helper.php
index 1c3b1064ff..72282362fe 100644
--- a/lib/private/helper.php
+++ b/lib/private/helper.php
@@ -335,14 +335,6 @@ class OC_Helper {
 		return !file_exists($dir);
 	}
 
-	/**
-	 * @return \OC\Files\Type\Detection
-	 * @deprecated 8.2.0 use \OC::$server->getMimeTypeDetector()
-	 */
-	static public function getMimetypeDetector() {
-		return \OC::$server->getMimeTypeDetector();
-	}
-
 	/**
 	 * @return \OC\Files\Type\TemplateManager
 	 */
diff --git a/tests/lib/helper.php b/tests/lib/helper.php
index 469ffecc77..51f7342f45 100644
--- a/tests/lib/helper.php
+++ b/tests/lib/helper.php
@@ -83,15 +83,6 @@ class Test_Helper extends \Test\TestCase {
 		$this->assertEquals($result, $expected);
 	}
 
-	function testGetFileNameMimeType() {
-		$this->assertEquals('text/plain', OC_Helper::getFileNameMimeType('foo.txt'));
-		$this->assertEquals('image/png', OC_Helper::getFileNameMimeType('foo.png'));
-		$this->assertEquals('image/png', OC_Helper::getFileNameMimeType('foo.bar.png'));
-		$this->assertEquals('application/octet-stream', OC_Helper::getFileNameMimeType('.png'));
-		$this->assertEquals('application/octet-stream', OC_Helper::getFileNameMimeType('foo'));
-		$this->assertEquals('application/octet-stream', OC_Helper::getFileNameMimeType(''));
-	}
-
 	function testGetStringMimeType() {
 		if (\OC_Util::runningOnWindows()) {
 			$this->markTestSkipped('[Windows] Strings have mimetype application/octet-stream on Windows');