Hide TheKing chess engine type if os is not Windows

CoreChess/Views/EnginesWindow.axaml.cs

@@ -2,12 +2,9 @@
 using Avalonia.Controls;
 using Avalonia.Interactivity;
 using Avalonia.Markup.Xaml;
-using ChessLib;
 using ChessLib.Engines;
-using CoreChess.Localizer;
 using System;
 using System.Collections.Generic;
-using System.IO;
 using System.Linq;
 
 namespace CoreChess.Views
@@ -30,6 +27,12 @@ protected override void InitializeComponent()
             AvaloniaXamlLoader.Load(this);
             base.InitializeComponent();
 
+            if (Environment.OSVersion.Platform != PlatformID.Win32NT) {
+                var cb = this.FindControl<ComboBox>("m_EngineType");
+                var items = cb.Items as Avalonia.Collections.AvaloniaList<object>;
+                items.RemoveAt(3);
+            }
+
             m_Engines = new List<EngineBase>(App.Settings.Engines);
             m_List = this.FindControl<Controls.ItemsList>("m_List");
             m_List.Items = m_Engines.OrderBy(e => e.Name);