This might come as a shock to you, but nobody is downloading an .exe and running it on their computer any more, which does not work on Mac/Linux/Android/iOS etc anyway. In fact, if you do that, people likely think it's virus unless you are Microsoft or something.
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As someone mostly familiar with non-web UIs - isn't the real question "why aren't you using MVC instead of a big lump of spaghetti?"
This might come as a shock to you, but nobody is downloading an .exe and running it on their computer any more, which does not work on Mac/Linux/Android/iOS etc anyway. In fact, if you do that, people likely think it's virus unless you are Microsoft or something.