diff --git a/lib/db/upgrade.php b/lib/db/upgrade.php
index 591f669ce30..9e42894eeb7 100644
--- a/lib/db/upgrade.php
+++ b/lib/db/upgrade.php
@@ -2345,5 +2345,21 @@ function xmldb_main_upgrade($oldversion) {
         upgrade_main_savepoint(true, 2013051404.04);
     }
 
+    if ($oldversion < 2013051405.10) {
+            // Fixing possible wrong MIME type for DigiDoc files.
+            $extensions = array('%.bdoc', '%.cdoc', '%.ddoc');
+            $select = $DB->sql_like('filename', '?', false);
+            foreach ($extensions as $extension) {
+                $DB->set_field_select(
+                    'files',
+                    'mimetype',
+                    'application/x-digidoc',
+                    $select,
+                    array($extension)
+                );
+            }
+            upgrade_main_savepoint(true, 2013051405.10);
+        }
+
     return true;
 }
diff --git a/lib/filelib.php b/lib/filelib.php
index 2d5946c5472..411cdcbe835 100644
--- a/lib/filelib.php
+++ b/lib/filelib.php
@@ -1454,6 +1454,9 @@ function &get_mimetypes_array() {
         'dmg'  => array ('type'=>'application/octet-stream', 'icon'=>'unknown'),
 
         'doc'  => array ('type'=>'application/msword', 'icon'=>'document', 'groups'=>array('document')),
+        'bdoc' => array ('type'=>'application/x-digidoc', 'icon'=>'document', 'groups'=>array('archive')),
+        'cdoc' => array ('type'=>'application/x-digidoc', 'icon'=>'document', 'groups'=>array('archive')),
+        'ddoc' => array ('type'=>'application/x-digidoc', 'icon'=>'document', 'groups'=>array('archive')),
         'docx' => array ('type'=>'application/vnd.openxmlformats-officedocument.wordprocessingml.document', 'icon'=>'document', 'groups'=>array('document')),
         'docm' => array ('type'=>'application/vnd.ms-word.document.macroEnabled.12', 'icon'=>'document'),
         'dotx' => array ('type'=>'application/vnd.openxmlformats-officedocument.wordprocessingml.template', 'icon'=>'document'),