Index: wp-includes/general-template.php
===================================================================
--- wp-includes/general-template.php	(revision 36017)
+++ wp-includes/general-template.php	(working copy)
@@ -1489,6 +1489,8 @@
 	 *
 	 * @param string $link_html The archive HTML link content.
 	 */
+	//var_dump('hoge'.$link_html);
+	//var_dump(apply_filters( 'get_archives_link', $link_html ));
 	return apply_filters( 'get_archives_link', $link_html );
 }
 
@@ -1623,9 +1625,6 @@
 			$after = $r['after'];
 			foreach ( (array) $results as $result ) {
 				$url = get_month_link( $result->year, $result->month );
-				if ( 'post' !== $r['post_type'] ) {
-					$url = add_query_arg( 'post_type', $r['post_type'], $url );
-				}
 				/* translators: 1: month name, 2: 4-digit year */
 				$text = sprintf( __( '%1$s %2$d' ), $wp_locale->get_month( $result->month ), $result->year );
 				if ( $r['show_post_count'] ) {
@@ -1646,9 +1645,6 @@
 			$after = $r['after'];
 			foreach ( (array) $results as $result) {
 				$url = get_year_link( $result->year );
-				if ( 'post' !== $r['post_type'] ) {
-					$url = add_query_arg( 'post_type', $r['post_type'], $url );
-				}
 				$text = sprintf( '%d', $result->year );
 				if ( $r['show_post_count'] ) {
 					$r['after'] = ' (' . $result->posts . ')' . $after;
@@ -1668,9 +1664,6 @@
 			$after = $r['after'];
 			foreach ( (array) $results as $result ) {
 				$url  = get_day_link( $result->year, $result->month, $result->dayofmonth );
-				if ( 'post' !== $r['post_type'] ) {
-					$url = add_query_arg( 'post_type', $r['post_type'], $url );
-				}
 				$date = sprintf( '%1$d-%2$02d-%3$02d 00:00:00', $result->year, $result->month, $result->dayofmonth );
 				$text = mysql2date( $archive_day_date_format, $date );
 				if ( $r['show_post_count'] ) {
@@ -1699,9 +1692,6 @@
 					$arc_week_start = date_i18n( $archive_week_start_date_format, $arc_week['start'] );
 					$arc_week_end   = date_i18n( $archive_week_end_date_format, $arc_week['end'] );
 					$url            = sprintf( '%1$s/%2$s%3$sm%4$s%5$s%6$sw%7$s%8$d', home_url(), '', '?', '=', $arc_year, '&', '=', $result->week );
-					if ( 'post' !== $r['post_type'] ) {
-						$url = add_query_arg( 'post_type', $r['post_type'], $url );
-					}
 					$text           = $arc_week_start . $archive_week_separator . $arc_week_end;
 					if ( $r['show_post_count'] ) {
 						$r['after'] = ' (' . $result->posts . ')' . $after;