Index: wp-admin/includes/post.php
===================================================================
--- wp-admin/includes/post.php	(revision 12081)
+++ wp-admin/includes/post.php	(working copy)
@@ -837,6 +837,23 @@
 }
 
 /**
+ * Get default post mime types
+ *
+ * @since 2.9.0
+ *
+ * @return array
+ */
+function get_post_mime_types() {
+	$post_mime_types = array(	//	array( adj, noun )
+		'image' => array(__('Images'), __('Manage Images'), _n_noop('Image <span class="count">(%s)</span>', 'Images <span class="count">(%s)</span>')),
+		'audio' => array(__('Audio'), __('Manage Audio'), _n_noop('Audio <span class="count">(%s)</span>', 'Audio <span class="count">(%s)</span>')),
+		'video' => array(__('Video'), __('Manage Video'), _n_noop('Video <span class="count">(%s)</span>', 'Video <span class="count">(%s)</span>')),
+	);
+
+	return apply_filters('post_mime_types', $post_mime_types);
+}
+
+/**
  * {@internal Missing Short Description}}
  *
  * @since unknown
@@ -871,13 +888,8 @@
 	if ( empty($media_per_page) )
 		$media_per_page = 20;
 	$q['posts_per_page'] = $media_per_page;
-	$post_mime_types = array(	//	array( adj, noun )
-				'image' => array(__('Images'), __('Manage Images'), _n_noop('Image <span class="count">(%s)</span>', 'Images <span class="count">(%s)</span>')),
-				'audio' => array(__('Audio'), __('Manage Audio'), _n_noop('Audio <span class="count">(%s)</span>', 'Audio <span class="count">(%s)</span>')),
-				'video' => array(__('Video'), __('Manage Video'), _n_noop('Video <span class="count">(%s)</span>', 'Video <span class="count">(%s)</span>')),
-			);
-	$post_mime_types = apply_filters('post_mime_types', $post_mime_types);
 
+	$post_mime_types = get_post_mime_types();
 	$avail_post_mime_types = get_available_post_mime_types('attachment');
 
 	if ( isset($q['post_mime_type']) && !array_intersect( (array) $q['post_mime_type'], array_keys($post_mime_types) ) )
Index: wp-admin/includes/media.php
===================================================================
--- wp-admin/includes/media.php	(revision 12081)
+++ wp-admin/includes/media.php	(working copy)
@@ -1101,7 +1101,7 @@
  * @return string HTML form for attachment.
  */
 function get_media_item( $attachment_id, $args = null ) {
-	global $post_mime_types, $redir_tab;
+	global $redir_tab;
 
 	if ( ( $attachment_id = intval($attachment_id) ) && $thumb_url = get_attachment_icon_src( $attachment_id ) )
 		$thumb_url = $thumb_url[0];
@@ -1126,12 +1126,10 @@
 		$tags = esc_attr(join(', ', $tags));
 	}
 
-	$type = '';
-	if ( isset($post_mime_types) ) {
-		$keys = array_keys(wp_match_mime_types(array_keys($post_mime_types), $post->post_mime_type));
-		$type = array_shift($keys);
-		$type_html = "<input type='hidden' id='type-of-$attachment_id' value='" . esc_attr( $type ) . "' />";
-	}
+	$post_mime_types = get_post_mime_types();
+	$keys = array_keys(wp_match_mime_types(array_keys($post_mime_types), $post->post_mime_type));
+	$type = array_shift($keys);
+	$type_html = "<input type='hidden' id='type-of-$attachment_id' value='" . esc_attr( $type ) . "' />";
 
 	$form_fields = get_attachment_fields_to_edit($post, $errors);
 
Index: wp-admin/upload.php
===================================================================
--- wp-admin/upload.php	(revision 12081)
+++ wp-admin/upload.php	(working copy)
@@ -146,13 +146,7 @@
 		$page_links_total = ceil($wpdb->get_var( "SELECT FOUND_ROWS()" ) / 25);
 	}
 
-	$post_mime_types = array(
-				'image' => array(__('Images'), __('Manage Images'), _n_noop('Image (%s)', 'Images (%s)')),
-				'audio' => array(__('Audio'), __('Manage Audio'), _n_noop('Audio (%s)', 'Audio (%s)')),
-				'video' => array(__('Video'), __('Manage Video'), _n_noop('Video (%s)', 'Video (%s)')),
-			);
-	$post_mime_types = apply_filters('post_mime_types', $post_mime_types);
-
+	$post_mime_types = get_post_mime_types();
 	$avail_post_mime_types = get_available_post_mime_types('attachment');
 
 	if ( isset($_GET['post_mime_type']) && !array_intersect( (array) $_GET['post_mime_type'], array_keys($post_mime_types) ) )