http://bugs.winehq.org/show_bug.cgi?id=31432
--- Comment #1 from Lucas Fialho Zawacki lfzawacki@yahoo.com.br 2012-08-15 21:31:52 CDT --- This error is weird and may be due to the fact that you moved the installation from another computer. Most of the times applications do more than just creating files (e.g. set register values, write config file, ...).
Try installing it from the CD in your iMac and if it then doesnt work attach a +dinput log.