Line 14 in sapphire/core/ManifestBuilder.php
should be changed from
define("MANIFEST_FILE", TEMP_FOLDER . "/manifest" . str_replace(array("/",":"),"_", $_SERVER['SCRIPT_FILENAME']));
to
define("MANIFEST_FILE", TEMP_FOLDER . "/manifest" . str_replace(array("/", ":", "\\"),"_", $_SERVER['SCRIPT_FILENAME']));
so that also the Windows directory delimiters ("\") are handled correctly. Another - maybe more elegant - solution would be to use the DIRECTORY_SEPARATOR constant (http://php.net/dir)