http://bugs.winehq.org/show_bug.cgi?id=16142
--- Comment #2 from Ken Sharp kennybobs@o2.co.uk 2009-08-06 15:09:17 --- err:eventlog:ReportEventW L"Adobe AIR\n(C:\windows\profiles\austin\Local Settings\Application Data\Adobe\Reader 9.0\Setup Files\AIR\Adobe AIR Installer.exe)" err:eventlog:ReportEventW L"\n" err:eventlog:ReportEventW L"Another instance of this program is already running. You cannot run multiple instances at the same time.\n"
Something to do with launching the Adobe AIR installer? Does this happen under Windows but the installer exits silently?
Under Adobe Reader 9.1 this doesn't occur, so maybe it was a bug in 9.0. There's still a bug in Wine though, whatever it is.