AFAIK you'd have to play it in BI, if you look in the tutorials sub forum you should find a tutorial for using RTW units in BI (its not too complicated)
Sorry my bad the file is actually called export_descr_unit and is found in the data folder (obviously BI/data for BI)
If you look throught the file you can find a unit that has can_swim and you'll see how it works
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