I can try!
This was part of the qti export routine. AFAIK, it turns out to be for exporting complete quizzes (not categories) - but only as part of their customisations. That export routine was part of the author's highly customised quiz module and as needed quite a lot of 'pruning'. I think I am just going to take that file out, as it doesn't really do anything!
Quiz
What is imsattempt.php for?
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