try different window icon load strategy

src/OneWare.Essentials/Converters/PathToWindowIconConverter.cs

@@ -1,27 +1,35 @@
 using System.Globalization;
+using System.Reflection;
 using Avalonia.Controls;
 using Avalonia.Data.Converters;
+using Avalonia.Media.Imaging;
+using Avalonia.Platform;
 
 namespace OneWare.Essentials.Converters;
 
 public class PathToWindowIconConverter : IValueConverter
 {
     public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
     {
-        if (value is string st)
+        if (value == null)
+            return null;
+
+        if (value is not string rawUri || !targetType.IsAssignableFrom(typeof(WindowIcon)))
+            throw new NotSupportedException();
+        Uri uri;
+
+        // Allow for assembly overrides
+        if (rawUri.StartsWith("avares://"))
+        {
+            uri = new Uri(rawUri);
+        }
+        else
         {
-            if (st.StartsWith("avares://"))
-            {
-                st = st.Remove(0, "avares://".Length);
-                var nextSlash = st.IndexOf("/", StringComparison.Ordinal);
-                if (nextSlash > -1)
-                {
-                    st = st.Remove(0, nextSlash + 1);
-                }
-                return new WindowIcon(st);
-            }
+            var assemblyName = Assembly.GetEntryAssembly()?.GetName().Name;
+            uri = new Uri($"avares://{assemblyName}{rawUri}");
         }
-        return null;
+
+        return new WindowIcon(new Bitmap(AssetLoader.Open(uri)));;
     }
 
     public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)