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CSVs exported via Advanced Order Export are a little bit different from those you may be familiar with. Most headers in the CSV file are self-explanatory: There are columns for Order ID, Date, Time, etc.
There are some new fields in this file to note, though. The ItemData fields contain bar (|) delimited data for each item in the order.
If one item was in the order, only ItemData_1 will contain data. If two items were in the order, ItemData_1 and ItemData_2 will contain data, and so on.