>The code below is a trivial routine to pack all the files in a given directory. It works fine on my own machine, but if I install the program on a remote machine it falls over telling me that one of the files is in use. Given the first line (close all), I am at a loss to understand how this is possible or what I can do about it, although, as you will see, I have attempted a bodge to trap it.
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>Any theories?

Is the table open by someone else on the network? Close all only closes tables that are open locally.