Use the creation date of the files to order them.
Since he can create several files in a short interval, so that even Time::HiRes isn't updated quickly enough (update interval is 18 times a second, on Windows), and the resolution of creation date is in general only 1 or 2 seconds, I am certain you haven't solved the OP's problem.

In reply to Re^3: Unique filenames with Time::HiRes by bart
in thread Unique filenames with Time::HiRes by AcidHawk

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