Add code to decode OS/2 monochrome icons and pointers, and a separate Icon Viewer for debugging.

iconviewer/iconviewer.Desktop/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+  <dict>
+    <key>CFBundleName</key>
+    <string>iconviewer</string>
+    <key>CFBundleIdentifier</key>
+    <string>com.example.iconviewer</string>
+    <key>CFBundleShortVersionString</key>
+    <string>1.0</string>
+    <key>LSMinimumSystemVersion</key>
+    <string>10.7</string>
+    <key>CFBundleDevelopmentRegion</key>
+    <string>en</string>
+    <key>NSHumanReadableCopyright</key>
+    <string></string>
+    <key>CFBundleIconFile</key>
+    <string>MacIcon.icns</string>
+  </dict>
+</plist>

iconviewer/iconviewer.Desktop/Program.cs

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+using System;
+using Eto.Forms;
+using Eto.Drawing;
+
+namespace iconviewer.Desktop
+{
+    class Program
+    {
+        [STAThread]
+        static void Main(string[] args)
+        {
+            new Application(Eto.Platform.Detect).Run(new MainForm());
+        }
+    }
+}

iconviewer/iconviewer.Desktop/iconviewer.Desktop.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+	
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net461</TargetFramework>
+  </PropertyGroup>
+	
+  <ItemGroup>
+    <PackageReference Include="Eto.Platform.Wpf" Version="2.4.1" />
+    <PackageReference Include="Eto.Platform.Gtk" Version="2.4.1" />
+    <PackageReference Include="Eto.Platform.Mac64" Version="2.4.1" />
+  </ItemGroup>
+	
+  <ItemGroup>
+    <ProjectReference Include="..\iconviewer\iconviewer.csproj" />
+  </ItemGroup>
+</Project>