Thanks a lot, that was of great help, Ray. That was actually, what I was doing (more or less). I copied and renamed a script and did some marginal changes, just to check if it works - and then the new script seems to be displayed in Utility scripts under the same name as before..??... A second script, so to speak. I now have "Custom wind farm output file" two times, although I changed the filename. That was the reason, why I didn`t find anything before. I appreciate your help, cheers, Lars