Thanks for the screenshot, I need all installed versions not just the latest, when you run your setup for the next version of Arduino (maybe 1.0.1.a or something) will it produce a second set of data as per the first screenshot, or will it overwrite that information? If it produces a second set of data for 1.0.1.a then that should be ok for me. I can see why you would want to avoid writing to the registry, it is not something I do often myself.