...

If so, the problem is that we don't support files >4GB in releases prior to ONTAP 5.1.

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And what about later versions (just because the question is so obviously un-answered)?

If we didn't support it in 5.1 or later versions, I would have said "the problem is that we don't support files >4GB" without adding "prior to ONTAP 5.1" - I assumed, apparently incorrectly, that it was obvious from the way I stated it....