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The XDD extract mapping method is standard support.
The OFFSET.DAT file you mention was a pseudo-custom implementation originally submitted by CSC/PMSC for their customers. It was added to the product as a curtesy and not really promoted as a mainstream feature (if that is a good term). As such, that feature is not specifically targeted by QA testing or included in internal regression results. I'm not even sure it is documented. I doubt you would be able to get much help (or quickly) via Support if you had questions.
Therefore, the official recommendation would be to use the XDD, but if you have experience with the OFFSET.DAT method and are comfortable with the functionality, then the feature should still be available.