Right, I'll peruse your logs... May or may not find problem. BTW, what is the problem/error, exactly. How exactly does it not work?
Do NT and XP have the same client/file privileges?
Can you run the CAE (which may not be supported by IBM anymore) segment on each box?
Is each box pointing to the correct AccessDB? Is it local or networked?
Can each box use CAE to see the AS400? Can each box see the AccessDB? If so what is the error/problem, exactly?