Hi Mike,
Are you, as in the earlier post, also wanting to connect to an MS Access DB?
'Cause if you're wanting to connect to a PSQL database, you don't need a local DSN at all, System, User, File, whatever.
Else, I should think that it wouldn't matter to uniPaaS or XPA what TYPE of DSN is was, although it may indeed matter WHERE a file DSN is stored.
HTH
Steve Blank