[Bug 20006] New: Adobe Reader 9.1 installer crashes near end

http://bugs.winehq.org/show_bug.cgi?id=20006

Summary: Adobe Reader 9.1 installer crashes near end
           Product: Wine
           Version: 1.1.29
          Platform: PC
               URL: http://ardownload.adobe.com/pub/adobe/reader/win/9.x/9
                    .1/enu/AdbeRdr910_en_US.exe
        OS/Version: Linux
            Status: NEW
          Keywords: download, Installer
          Severity: normal
          Priority: P2
         Component: msi
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

The installer seems to run fine, but during "Optimizing performance...",
wine puts up an msiexec crash dialog.   If you click through that, though,
it says it installed ok.

wine AdbeRdr910_en_US.exe /SAll
...
err:msi:register_progid L"PDXFileType" has no class
wine: Unhandled division by zero at address 0x1000aa92 (thread 000d), starting
debugger...
Backtrace:
=>0 0x1000aa92 in msi708b.tmp (+0xaa92) (0x008ae6ac)
  1 0x00000001 (0x7ed1ceac)

(Also happens without the silent install option.)

I didn't see anything obvious in the +relay log.  I'll attach
a compressed +relay,+msi,+process log, starting at where the custom action
dll with the problem was created.  (Too big to attach untruncated, sorry.)
Here are the two or so lines before the problem:

003d:Call KERNEL32.WideCharToMultiByte(00000000,00000000,00963730 L"1:
DefragmentFiles 2: Finished setting up action data and progress bar 3:  4:  5: 
",ffffffff,00963498,00000054,00000000,00000000) ret=7ed03712
003d:Ret  KERNEL32.WideCharToMultiByte() retval=00000054 ret=7ed03712
003d:Ret  msi.MsiProcessMessage() retval=00000000 ret=10001481
trace:seh:raise_exception code=c0000094 flags=0 addr=0x1000aa92 ip=1000aa92
tid=003d