http://bugs.winehq.org/show_bug.cgi?id=31113
--- Comment #95 from Michael Gratton mike@vee.net 2013-07-31 19:57:08 CDT --- (In reply to comment #92)
So I have confirmed that the underlying cause of the data file errors is due to the load order of the civ5pkg files on startup (which also break BNW). Unfortnately, due to the APIs being involved being extremely core to WINE combined with the fact that this app only works due to luck (its taking advantage of a quirk in Windows that is only true some of the time), there is no real way to patch this.
Can you please post the details of this in a new bug so it can get fixed? Even if it is luck that it works through an undocumented quirk of the MS implementation of the API, for compatibility Wine should be doing the same thing anyway. This bug should be a dependency on that bug.
Thanks for digging into this!