diff --git a/lib/Alchemy/Phrasea/Controller/Prod/Property.php b/lib/Alchemy/Phrasea/Controller/Prod/Property.php
index 1cd991b716..925a6485a1 100644
--- a/lib/Alchemy/Phrasea/Controller/Prod/Property.php
+++ b/lib/Alchemy/Phrasea/Controller/Prod/Property.php
@@ -244,6 +244,7 @@ class Property implements ControllerProviderInterface
     public function changeType(Application $app, Request $request)
     {
         $typeLst = $request->request->get('types', array());
+        $mimeLst = $request->request->get('mimes', array());
         $records = RecordsRequest::fromRequest($app, $request, false, array('canmodifrecord'));
         $forceType = $request->request->get('force_types', '');
         $updated = array();
@@ -251,10 +252,16 @@ class Property implements ControllerProviderInterface
         foreach ($records as $record) {
             try {
                 $recordType = !empty($forceType) ? $forceType : (isset($typeLst[$record->get_serialize_key()]) ? $typeLst[$record->get_serialize_key()] : null);
+                $mimeType = isset($mimeLst[$record->get_serialize_key()]) ? $mimeLst[$record->get_serialize_key()] : null;
 
                 if ($recordType) {
                     $record->set_type($recordType);
-                    $updated[$record->get_serialize_key()] = $recordType;
+                    $updated[$record->get_serialize_key()]['record_type'] = $recordType;
+                }
+
+                if ($mimeType) {
+                    $record->set_mime($mimeType);
+                    $updated[$record->get_serialize_key()]['mime_type'] = $mimeType;
                 }
             } catch (\Exception $e) {
 
diff --git a/lib/classes/record/adapter.php b/lib/classes/record/adapter.php
index 03ebc4bde4..d2a0b6a81c 100644
--- a/lib/classes/record/adapter.php
+++ b/lib/classes/record/adapter.php
@@ -319,6 +319,32 @@ class record_adapter implements record_Interface, cache_cacheableInterface
         return $this;
     }
 
+    public function set_mime($mime)
+    {
+        $old_mime = $this->get_mime();
+
+        // see http://lists.w3.org/Archives/Public/xml-dist-app/2003Jul/0064.html
+        if (!preg_match("/^[a-zA-Z0-9!#$%^&\*_\-\+{}\|'.`~]+\/[a-zA-Z0-9!#$%^&\*_\-\+{}\|'.`~]+$/", $mime)) {
+            throw new \Exception(sprintf('Unrecognized mime type %s', $mime));
+        }
+
+        $connection = connection::getPDOConnection($this->app, $this->get_sbas_id());
+
+        $sql = 'UPDATE record SET mime = :mime WHERE record_id = :record_id';
+        $stmt = $connection->prepare($sql);
+        $stmt->execute(array(':mime' => $mime, ':record_id' => $this->get_record_id()));
+        $stmt->closeCursor();
+
+        if ($mime !== $old_mime) {
+            $this->rebuild_subdefs();
+        }
+
+        $this->mime = $mime;
+        $this->delete_data_from_cache();
+
+        return $this;
+    }
+
     /**
      * Return true if the record is a grouping
      *
@@ -1176,7 +1202,7 @@ class record_adapter implements record_Interface, cache_cacheableInterface
      *
      * @return record_adapter
      */
-    public function rebuild_subdefs()
+    public function     rebuild_subdefs()
     {
         $connbas = connection::getPDOConnection($this->app, $this->get_sbas_id());
         $sql = 'UPDATE record SET jeton=(jeton | ' . JETON_MAKE_SUBDEF . ') WHERE record_id = :record_id';
diff --git a/templates/web/prod/actions/Property/type.html.twig b/templates/web/prod/actions/Property/type.html.twig
index 591db4ead2..e58827087b 100644
--- a/templates/web/prod/actions/Property/type.html.twig
+++ b/templates/web/prod/actions/Property/type.html.twig
@@ -28,13 +28,14 @@
                         <div class="thumbnail" style="min-height:205px">
                             {{ thumbnail.format(record.get_thumbnail(), 160, 120, "", false, false) }}
                             <div class="caption">
-                                <h5>{{ record.get_title() }}</h5>
+                                <h5 style="word-break:break-all;">{{ record.get_title() }}</h5>
                                 <p>
-                                    <select name="types[{{record.get_serialize_key()}}]" style="width:100%">
+                                    <select name="types[{{record.get_serialize_key()}}]" class="input-block-level">
                                         {% for option in typesEnum %}
                                             <option value="{{ option }}" {{ record.is_grouping() ? "disabled='disabled'": "" }} {{ option == record.get_type() ? "selected='selected'" : '' }}>{{ option }}</option>
                                         {% endfor %}
                                     </select>
+                                    <input class="input-block-level" type="text" name="mimes[{{record.get_serialize_key()}}]" value="{{ record.get_mime }}" style="width:100%">
                                 </p>
                             </div>
                         </div>