The issue at the time was having a WinForms application to run also on macOS, and IIRC at the time WinForms wasn't supported outside of Windows. Maybe Mono on Windows is still different from Mono on macOS. Anyway, the situation seem to be much better now. I'm not going to invest time into C# at the moment, since I'm in the Java ecosystem and Im currently taking some time to practice with Kotlin. But it's good to know that now C# is an option as well.
Forgot to include my OS: I ran a .NET (Framework? I think) .exe I built on Windows in 2020, on Linux with Mono and it worked and looked (aside from thematic differences) like I remembered it looking in 2024.
Now that I thought a bit more about it, I think I unlocked a memory of WinForms working on some macOS versions and not others. Maybe it was even just supported on 32 bits versions and not in 64 bit versions. One way or another, the bottom line was that it wasn't going to work on the latest macOS version at the time. But I actually tried it on Linux and it worked there.
