My guess is that he has no .pab file and is instead using the Contacts folder. If he really does have one, you should be able to view its properties through Outlook, but the details depend on your Outlook version.

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Sue Mosher, Outlook MVP
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> Hi I have user who has a created a *.pab which he wishes
> to transfer to another users pc, I cannot find his pab
[quoted text clipped - 3 lines]
> to see if there is any clue there, but nothing, please
> help