OK But in the manual it suggests that if the parameter is empty then it'll return all the keys. Anyway, I've worked it out now, the script simply wasn't finding the file! I'm working on a new 2012 server and had forgotten to show all file extensions. So only now do I find out that my .ini file is actually called PrinterData.ini.txt (simple mistake but what a doofus). Right, on with the scripting!!