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From reading the docs it sounds like all of the steam functions read data for which ever user is logged into the steam client
on the computer desktop, nothing to do with Gamemaker.
So I'd have to fudge so that when a user logs in there dlc status is recorded on a list and compared to another list. I didn't really want to do it this way. I can't even use the steam cloud because it is private so id have to store the info on the only shared resource available which is the high score boards.