[Bug 31226] New: MathCad 15 installer fails without native dotnet35sp1

http://bugs.winehq.org/show_bug.cgi?id=31226

Bug #: 31226
           Summary: MathCad 15 installer fails without native dotnet35sp1
           Product: Wine
           Version: 1.5.8
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: -unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
    Classification: Unclassified

Tried repeating bug 31201 without native dotnet35sp1.
When the installer's progress bar hits about 50%,
I get a dialog
   Fatal error in gc
   GetThreadContext failed
Using ps, I see it's coming from "C:\users\dank\Temp\msi1c95.tmp HandBooks"
This is a 24KB .net executable, and running it by hand while that dialog
is still up generates another instance of the fatal error.

One sees lots of this error message on the web, mostly from Unity3d
apps conflicting with antivirus programs.  I also recall seeing this
before when using Mono in Wine, so it's not specific to this app.

See also bug 30914 for another GetThreadContext failure which may be
the same problem.