Index: Slim/Web/HTTP.pm
===================================================================
--- Slim/Web/HTTP.pm	(revision 3811)
+++ Slim/Web/HTTP.pm	(working copy)
@@ -839,7 +839,7 @@
 				$response->content_type( $Slim::Music::Info::types{$obj->content_type()} );
 				$response->content_length($obj->filesize());
 				$response->header('Content-Disposition', 
-					sprintf('attachment; filename=%s', unescape(basename($obj->url())))
+					sprintf('attachment; filename="%s"', unescape(basename($obj->url())))
 				);
 
 				my $headers = _stringifyHeaders($response) . $CRLF;