Index: wp-includes/media-template.php
===================================================================
--- wp-includes/media-template.php	(revision 23992)
+++ wp-includes/media-template.php	(working copy)
@@ -347,10 +347,10 @@
 					data-user-setting="urlbutton"
 				<# } #>>
 
-				<option value="file" selected>
+				<option value="file">
 					<?php esc_attr_e('Media File'); ?>
 				</option>
-				<option value="post">
+				<option value="post" selected>
 					<?php esc_attr_e('Attachment Page'); ?>
 				</option>
 			</select>