[Bug 31165] New: Kareo installer puts up fatal dialog on startup

http://bugs.winehq.org/show_bug.cgi?id=31165

Bug #: 31165
           Summary: Kareo installer puts up fatal dialog on startup
           Product: Wine
           Version: 1.5.8
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: msi
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
    Classification: Unclassified

The installer downloadable from http://www.kareo.com/help/downloads/kareo
fails to start; it complains
  1628: Failed to complete installation
A +msi,+seh log shows the error happens shortly after
  trace:msi:ACTION_CustomAction Handling custom action L"RemoveAdmin_V23" (62
(null) L"MsiExec.exe /X{8377809B-9797-4574-BBDF-24046AFDD6A1}")

That calls HANDLE_CustomType34(package 0x1788e8, source (null)),
which calls msi_get_loaded_folder 
which crashes because dir is null.
Sounds like an msi bug?