private String normalize(String filename, String workingDirectory) {
		if (getPrefixLength(filename) == 0 && workingDirectory != null) {
			filename = workingDirectory + File.separator + filename;
		}
		return doNormalize(filename);
	}
File delete access is allowed <br>
on "agent.exec.folder".

@param file file path
ngrinder-runtime/src/main/java/org/ngrinder/sm/NGrinderSecurityManager.java