https://bugs.winehq.org/show_bug.cgi?id=52131
--- Comment #22 from Eric eric.wheez@gmail.com --- Looking at PropagationPrediction.PredictionClass.CreateDVOACapQuery in ILspy, it looks like the input frequency is first stored as a double, then PropagationPrediction.PredictionClass.GridSquareToDecimalDegrees is run (but has no frequency inputs at all), then some math and double-to-string & string-to-double conversions are run on the input frequency.
I'm not actually sure if the Structured exception handling (SEH) error is with the way that the math/conversions are being handled in .NET, or if the SEH error is coming from the dvoa.dll Delphi library's erroring/exception.
I suppose another thing to check would be to see where dvoa.dll came from and whether that's open-source or not.
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From Microsoft, "Structured exception handling (SEH) is a Microsoft extension
to C to handle certain exceptional code situations, such as hardware faults, gracefully." https://docs.microsoft.com/en-us/cpp/cpp/structured-exception-handling-c-cpp...