diff -r fbe52dda730c -r 3a4788a4127c src/pyams_content/component/extfile/__init__.py
--- a/src/pyams_content/component/extfile/__init__.py	Mon Jul 20 15:21:56 2020 +0200
+++ b/src/pyams_content/component/extfile/__init__.py	Mon Aug 31 14:35:09 2020 +0200
@@ -10,24 +10,25 @@
 # FOR A PARTICULAR PURPOSE.
 #
 
-__docformat__ = 'restructuredtext'
-
 import os
 
 from pyramid.events import subscriber
 from pyramid.threadlocal import get_current_registry
+from zope.dublincore.interfaces import IZopeDublinCore
 from zope.interface import alsoProvides, implementer
 from zope.lifecycleevent import ObjectModifiedEvent
-from zope.lifecycleevent.interfaces import IObjectAddedEvent, IObjectModifiedEvent, IObjectRemovedEvent
+from zope.lifecycleevent.interfaces import IObjectAddedEvent, IObjectModifiedEvent, \
+    IObjectRemovedEvent
 from zope.schema.fieldproperty import FieldProperty
 from zope.schema.vocabulary import SimpleTerm, SimpleVocabulary
 
 from pyams_content.component.association import AssociationItem
 from pyams_content.component.association.interfaces import IAssociationInfo
-from pyams_content.component.extfile.interfaces import IBaseExtFile, IExtAudio, IExtFile, IExtFileManagerInfo, \
-    IExtImage, IExtMedia, IExtVideo
+from pyams_content.component.extfile.interfaces import IBaseExtFile, IExtAudio, IExtFile, \
+    IExtFileManagerInfo, IExtImage, IExtMedia, IExtVideo
 from pyams_content.features.checker import BaseContentChecker
-from pyams_content.features.checker.interfaces import IContentChecker, MISSING_LANG_VALUE, MISSING_VALUE
+from pyams_content.features.checker.interfaces import IContentChecker, MISSING_LANG_VALUE, \
+    MISSING_VALUE
 from pyams_content.shared.common.interfaces import IWfSharedContent
 from pyams_file.file import EXTENSIONS_THUMBNAILS
 from pyams_file.interfaces import IFileInfo, IImage, IResponsiveImage
@@ -40,6 +41,9 @@
 from pyams_utils.traversing import get_parent
 from pyams_utils.vocabulary import vocabulary_config
 
+
+__docformat__ = 'restructuredtext'
+
 from pyams_content import _
 
 
@@ -90,7 +94,8 @@
             title = self.context.filename
             if '.' in title:
                 title, extension = title.rsplit('.', 1)
-        return '{0} {1}'.format(II18n(manager_info).query_attribute('default_title_prefix', request=request) or '',
+        return '{0} {1}'.format(II18n(manager_info).query_attribute('default_title_prefix',
+                                                                    request=request) or '',
                                 title)
 
     @property