dont't see it at the moment

Do you still see this, and if yes, with which Horde version?

it's the file backend



configuration:

$backends['file'] = array(

     'name' => 'Virtual Home Directories',

     'driver' => 'file',

     'preferred' => '',

     'hordeauth' => false,

     'params' => array(

         // The base location under which the user home directories live.

         'vfsroot' => '/home/apache/.horde/gollem/',

         // The default permissions to set for newly created folders and files.

         // 'permissions' => $conf['umask']

     ),

     'loginparams' => array(),

     'root' => '/' . Auth::getAuth(),

     'home' => '/' . Auth::getAuth(),

     'createhome' => true,

     // 'filter' => '^regex$',

     'quota' => '200 MB',

     'clipboard' => true,

     'attributes' => array('type', 'name', 'edit', 'download', 
'modified', 'size', 'permission', 'owner', 'group')

);

Which backend type is this?

missing attachement

as you can see the name column is empty and the entire name with 
extension is in type column, sorting on the empty name column sorts by 
name and also sorting by type sorts by type