If he wants the item to have a history/description, the item will have to be imported into his game, either as *.tbg or *.iap files, and this requires some specific tools - I don't know if they're available for Macs.
If he has an "Override" folder with *.itm files in it (Mac files have extensions, I assume), then the item should work ok, even if it doesn't have the description and history...
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