Index: src/wp-admin/includes/file.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- src/wp-admin/includes/file.php	(revision f584b5755ad66c5017fbf003ba98bd529afba9da)
+++ src/wp-admin/includes/file.php	(date 1530889050000)
@@ -2134,7 +2134,7 @@
 	 */
 	$error            = false;
 	$archive_url      = get_post_meta( $request_id, '_export_file_url', true );
-	$archive_pathname = get_post_meta( $request_id, '_export_file_path', true );
+	$archive_pathname = $exports_dir . get_post_meta( $request_id, '_export_file_path', true );
 
 	if ( empty( $archive_pathname ) || empty( $archive_url ) ) {
 		$archive_filename = $file_basename . '.zip';
@@ -2142,7 +2142,7 @@
 		$archive_url      = $exports_url . $archive_filename;
 
 		update_post_meta( $request_id, '_export_file_url', $archive_url );
-		update_post_meta( $request_id, '_export_file_path', wp_normalize_path( $archive_pathname ) );
+		update_post_meta( $request_id, '_export_file_path', $archive_filename );
 	}
 
 	if ( ! empty( $archive_pathname ) && file_exists( $archive_pathname ) ) {