Index: wp-includes/class-wp-http-curl.php
===================================================================
--- wp-includes/class-wp-http-curl.php	(revision 41254)
+++ wp-includes/class-wp-http-curl.php	(working copy)
@@ -179,8 +179,10 @@
 				$this->stream_handle = @fopen( $r['filename'], 'w+' );
 			else
 				$this->stream_handle = fopen( $r['filename'], 'w+' );
-			if ( ! $this->stream_handle )
-				return new WP_Error( 'http_request_failed', sprintf( __( 'Could not open handle for fopen() to %s' ), $r['filename'] ) );
+			if ( ! $this->stream_handle ) {
+				/* translators: 1: fopen() 2: file name */
+				return new WP_Error( 'http_request_failed', sprintf( __( 'Could not open handle for %1$s to %2$s.' ), 'fopen()', $r['filename'] ) );
+			}
 		} else {
 			$this->stream_handle = false;
 		}
Index: wp-includes/class-wp-http-streams.php
===================================================================
--- wp-includes/class-wp-http-streams.php	(revision 41254)
+++ wp-includes/class-wp-http-streams.php	(working copy)
@@ -223,8 +223,10 @@
 				$stream_handle = @fopen( $r['filename'], 'w+' );
 			else
 				$stream_handle = fopen( $r['filename'], 'w+' );
-			if ( ! $stream_handle )
-				return new WP_Error( 'http_request_failed', sprintf( __( 'Could not open handle for fopen() to %s' ), $r['filename'] ) );
+			if ( ! $stream_handle ) {
+				/* translators: 1: fopen() 2: file name */
+				return new WP_Error( 'http_request_failed', sprintf( __( 'Could not open handle for %1$s to %2$s.' ), 'fopen()', $r['filename'] ) );
+			}
 
 			$bytes_written = 0;
 			while ( ! feof($handle) && $keep_reading ) {