https://bugs.winehq.org/show_bug.cgi?id=46014
--- Comment #6 from Esme Povirk madewokherd@gmail.com --- The exception is because mono's Conversion.Hex converts from ulong to long, which breaks if the value >= 2**63. After fixing that, I get a NullReferenceException which happens because WindowsFormsApplicationBase does not call the Startup event.