Ticket #43908: 43908.diff

src/wp-admin/includes/file.php

@@ -2160 +2160 @@
 
         // Save the export file in the request.
         update_post_meta( $request_id, '_export_file_url', $archive_url );
-        update_post_meta( $request_id, '_export_file_path', $archive_pathname );
+        update_post_meta( $request_id, '_export_file_path', wp_normalize_path( $archive_pathname ) );
 }
 
 /**