http://bugs.winehq.org/show_bug.cgi?id=28007
--- Comment #8 from Vincent Povirk madewokherd@gmail.com --- Anastasius, what leads you to believe the gdiplus.dll shipped with Visio 2003 is different from the standard one in some significant way? I tried using the native dll installed by winetricks (deleting the ones in the office directory), and it seemed to work fine.
So it seems to me that unless you have good evidence that Visio needs private features that we shouldn't duplicate in Wine, there should be a bug filed for any problems with builtin gdiplus.