Index: StreamFile.php
===================================================================
--- StreamFile.php	(revision 44722)
+++ StreamFile.php	(working copy)
@@ -30,6 +30,9 @@
 	} else {
 		header('Content-type: application/x-wiki');
 	}
+	
+	# bug 15461: Make IE8 turn off content sniffing. Everbody else should ignore this
+	header( 'X-Content-Type-Options: nosniff' );
 
 	// Don't stream it out as text/html if there was a PHP error
 	if ( headers_sent() ) {