Add GUI.

exeinfogui/MainForm.xeto

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+<?xml version="1.0" encoding="UTF-8"?>
+<Form xmlns="http://schema.picoe.ca/eto.forms" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="ExeInfo GUI" ClientSize="400, 350" Padding="10">
+	<StackLayout Orientation="Vertical">
+        <StackLayoutItem HorizontalAlignment="Stretch">
+            <StackLayout Orientation="Horizontal">
+                <Label ID="lblFile">File:</Label>
+                <StackLayoutItem Expand="True">
+                    <TextBox ID="txtFile" ReadOnly="True" />
+                </StackLayoutItem>
+                <StackLayoutItem HorizontalAlignment="Right">
+                    <Button ID="btnLoad" Click="OnBtnLoadClick">Load</Button>
+                </StackLayoutItem>
+            </StackLayout>
+        </StackLayoutItem>
+        <StackLayoutItem HorizontalAlignment="Stretch">
+            <StackLayout Orientation="Horizontal">
+                <Label ID="lblType">Type:</Label>
+                <StackLayoutItem HorizontalAlignment="Stretch" Expand="True">
+                    <TextBox ID="txtType" ReadOnly="True" />
+                </StackLayoutItem>
+            </StackLayout>
+        </StackLayoutItem>
+        <StackLayoutItem HorizontalAlignment="Stretch" Expand="True">
+            <StackLayout Orientation="Vertical">
+                <Label ID="lblInformation">Type:</Label>
+                <StackLayoutItem HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Expand="True">
+                    <TextArea ID="txtInformation" ReadOnly="True" />
+                </StackLayoutItem>
+            </StackLayout>
+        </StackLayoutItem>
+	</StackLayout>
+	<Form.Menu>
+		<MenuBar>
+			<MenuBar.QuitItem>
+				<ButtonMenuItem ID="mnuQuit" Text="Quit" Shortcut="CommonModifier+Q" Click="OnMnuQuitClick" />
+			</MenuBar.QuitItem>
+			<MenuBar.AboutItem>
+				<ButtonMenuItem ID="mnuAbout" Text="About..." Click="OnMnuAboutClick" />
+			</MenuBar.AboutItem>
+		</MenuBar>
+	</Form.Menu>
+</Form>

exeinfogui/MainForm.xeto.cs

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+using System;
+using System.IO;
+using Eto.Forms;
+using Eto.Serialization.Xaml;
+using libexeinfo;
+
+namespace exeinfogui
+{
+    public class MainForm : Form
+    {
+        TextBox txtFile;
+        TextBox txtType;
+        TextArea txtInformation;
+
+        public MainForm()
+        {
+            XamlReader.Load(this);
+        }
+
+        protected void OnBtnLoadClick(object sender, EventArgs e)
+        {
+            txtFile.Text = "";
+            txtType.Text = "";
+            txtInformation.Text ="";
+
+            OpenFileDialog dlgOpen = new OpenFileDialog {Title = "Choose executable file", MultiSelect = false};
+
+            if(dlgOpen.ShowDialog(this) != DialogResult.Ok) return;
+
+            txtFile.Text = dlgOpen.FileName;
+
+            FileStream exeFs = File.Open(dlgOpen.FileName, FileMode.Open, FileAccess.Read);
+
+            MZ      mzExe   = new MZ(exeFs);
+            NE      neExe   = new NE(exeFs);
+            AtariST stExe   = new AtariST(exeFs);
+            LX      lxExe   = new LX(exeFs);
+            COFF    coffExe = new COFF(exeFs);
+            PE      peExe   = new PE(exeFs);
+
+            if(mzExe.IsMZ)
+            {
+                if(neExe.IsNE)
+                {
+                    txtType.Text        = "New Executable (NE)";
+                    txtInformation.Text = neExe.GetInfo();
+                }
+                else if(lxExe.IsLX)
+                {
+                    txtType.Text        = "Linear eXecutable (LX)";
+                    txtInformation.Text = lxExe.GetInfo();
+                }
+                else if(peExe.IsPE)
+                {
+                    txtType.Text        = "Portable Executable (PE)";
+                    txtInformation.Text = peExe.GetInfo();
+                }
+                else
+                    txtType.Text = "DOS Executable (MZ)";
+                
+                txtInformation.Text += mzExe.GetInfo();
+            }
+            else if(stExe.IsAtariST)
+            {
+                txtType.Text = "Atari ST executable";
+                txtInformation.Text = stExe.GetInfo();
+            }
+            else if(coffExe.IsCOFF)
+            {
+                txtType.Text = "Common Object File Format (COFF)";
+                txtInformation.Text = coffExe.GetInfo();
+            }
+            else
+                txtType.Text = "Format not recognized";
+        }
+
+        protected void OnMnuAboutClick(object sender, EventArgs e)
+        {
+            new AboutDialog().ShowDialog(this);
+        }
+
+        protected void OnMnuQuitClick(object sender, EventArgs e)
+        {
+            Application.Instance.Quit();
+        }
+    }
+}

exeinfogui/exeinfogui.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net461</TargetFramework>
+    <RootNamespace>exeinfogui</RootNamespace>
+    <PackageVersion>1.0</PackageVersion>
+    <Title>exeinfogui</Title>
+    <Copyright>Copyright © 2018</Copyright>
+    <Description>Description of exeinfogui</Description>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Eto.Forms" Version="2.4.1" />
+    <PackageReference Include="Eto.Serialization.Xaml" Version="2.4.1" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\libexeinfo\libexeinfo.csproj">
+      <Project>{5DD22357-AEA1-4B1D-9CAB-F51873A3A5D0}</Project>
+      <Name>libexeinfo</Name>
+    </ProjectReference>
+  </ItemGroup>
+</Project>