Given an even closer look, you're right ;) I saw MessageBox here[1] and assumed the implementation would just go through. After all, why would all other compone

Given an even closer look, you're right ;) I saw MessageBox here[1] and assumed the implementation would just go through. After all, why would all other components compile fine, except for MessageBox? But actually, it even logs in the console dl_mapping_symbol MessageBox - proc name MessageBox not matched So yep, MessageBox has no matched symbols so it crashes and burns. [1] https://github.com/roozbehid/WasmWinforms/blob/master/winforms/external/mono/mcs/class/Managed.Windows.Forms/System.Windows.Forms/MessageBox.cs https://github.com/roozbehid/WasmWinforms/blob/master/winfor...