*/
-require_once('common/tracker/ArtifactType.class');
-require_once('common/tracker/ArtifactExtraField.class');
-require_once('common/tracker/ArtifactExtraFieldElement.class');
+require_once('common/tracker/ArtifactType.class.php');
+require_once('common/tracker/ArtifactExtraField.class.php');
+require_once('common/tracker/ArtifactExtraFieldElement.class.php');
class ArtifactTypeHtml extends ArtifactType {