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I would think that you'd get an error message when the file is not found....
But there are plug ins you might install that let you list the contents of a folder. I suspect that you could use one of them to check for the presence of a folder on a specified drive and show an error message if it is not there to be found.
There´s no error message when i click in the button with the external HD disconnected. It behaves like there's no script atached to it.
However your sentence: "I would think that you'd get an error message when the file is not found....",
make me think there could be some kind of bug in my filemaker installation, that the error was there but somehow the dialog of the error doesn't pop up. So i try the Get(LastError) function and, guess what.. it WORKS!!
Thanks again to lead me in the right path.