diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 23e04cf504..9b5f292eec 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -1764,17 +1764,30 @@ function path_join( $base, $path ) {
  * @since 3.9.0
  * @since 4.4.0 Ensures upper-case drive letters on Windows systems.
  * @since 4.5.0 Allows for Windows network shares.
+ * @since 5.0.0 Allows for PHP file wrappers.
  *
  * @param string $path Path to normalize.
  * @return string Normalized path.
  */
 function wp_normalize_path( $path ) {
+	$wrapper = '';
+	if ( wp_is_stream( $path ) ) {
+		list( $wrapper, $path ) = explode( '://', $path, 2 );
+		$wrapper .= '://';
+	}
+
+	// Standardise all paths to use /
 	$path = str_replace( '\\', '/', $path );
+
+	// Replace multiple slashes down to a singular, allowing for network shares having two slashes.
 	$path = preg_replace( '|(?<=.)/+|', '/', $path );
+
+	// Windows paths should uppercase the drive letter
 	if ( ':' === substr( $path, 1, 1 ) ) {
 		$path = ucfirst( $path );
 	}
-	return $path;
+
+	return $wrapper . $path;
 }
 
 /**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index c25676b90f..53339ebd8f 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-42386';
+$wp_version = '5.0-alpha-42387';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.