[Bug 52131] wine-mono + RMS Express: HF Channel Selection Browser crashes

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52131

--- Comment #20 from Eric  ---
OK! I think I'm close:

I got better at using Improved dotNET Tracer for Windows (I found the "on/off"
button to specify when I want to start/stop tracing methods).  I traced

On a Windows computer, I traced RMS Express calculating "SFI" when...
 - input frequency is 55000 (which runs fine in wine-mono) 
 - input frequency is 54000 (crashes in wine-mono).

These methods pop up on Windows when input frequency is 54000 (but don't appear
when input frequency is 55000):
---- snip ----
  [PropagationPrediction.dll] Function compiled,
    GridSquareToDecimalDegrees,
    Module : PropagationPrediction.dll,
    Parent Class : PropagationPrediction.PredictionClass,
    Method ID : 0x844AD78,
    Method Token : 0600000D,
    CFF explorer index : 13,
  Exception Thrown,
    Exception type : System.Runtime.InteropServices.SEHException,
  Exception was thrown in method,
    Parent class : PropagationPrediction.PredictionClass,
    method : PredictPropagation,
    Method Token : 06000009,
    CFF explorer index : 9,

[WinlinkInterop.dll] Function compiled,
    Finalize,
    Module : WinlinkInterop.dll,
    Parent Class : WinlinkInterop.SFIhelper,
    Method ID : 0x93F4D3C,
    Method Token : 0600002F,
    CFF explorer index : 47,
---- snip ----

I bet the crash isn't from wine-mono calculating small value frequencies (in
PropagationPrediction.PredictionClass.CreateDVOACapQuery) any differently than
on Windows.

So, I think that both dotnet/Windows and wine-mono probably handle the
calculation the same but some exceptions get thrown by dvoa.dll as 'normal'
behavior in this case and dotnet somehow handles the exceptions, but wine-mono
doesn't know how to yet.