Add project files.

App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
+    </startup>
+</configuration>

App.xaml

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+<Application x:Class="RomSync.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:RomSync"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="pack://application:,,,/ToastNotifications.Messages;component/Themes/Default.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

App.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace RomSync
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

MainWindow.xaml

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+<Window x:Class="RomSync.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:RomSync"
+        mc:Ignorable="d"
+        Title="RomSync" Height="450"
+        DataContext="{Binding RelativeSource={RelativeSource Self}}"
+        Width="575.524"
+        Icon="Resources/programicon.png">
+
+    <Grid>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition />
+            <ColumnDefinition Width="5"/>
+            <ColumnDefinition />
+        </Grid.ColumnDefinitions>
+
+        <Grid.RowDefinitions>
+            <RowDefinition Height="30" />
+            <RowDefinition />
+            <RowDefinition Height="30" />
+        </Grid.RowDefinitions>
+
+        <StackPanel Orientation="Horizontal"
+                    Grid.Column="0"
+                    Grid.Row="0"
+                    VerticalAlignment="Center">
+
+            <Label Content="Input Path: "
+                   VerticalAlignment="Center" />
+
+            <TextBox Name="InputPathTextBox"
+                     Text="{Binding InputFileDirectory}"
+                     VerticalAlignment="Center"
+                     Width="150"/>
+
+            <Button Name="SelectInputPathButton"
+                    VerticalAlignment="Center"
+                    Click="SelectInputPathButton_Click"
+                    Margin="5,0,0,0"
+                    Content="Select..." 
+                    Padding="5,0,5,0"/>
+
+        </StackPanel>
+
+        <ListView Name="InputRomsListView"
+                  MouseLeftButtonUp="InputRomsListView_MouseLeftButtonUp"
+                  ItemsSource="{Binding InputRoms}"
+                  Grid.Column="0"
+                  Grid.Row="1">
+
+            <ListView.ItemTemplate>
+                <DataTemplate>
+                    <StackPanel Orientation="Horizontal">
+
+                        <Image Height="20"
+                               Width="20"
+                               Margin="0,0,10,0"
+                               Source="{Binding SyncStatusImage}" />
+
+                        <Image Height="20"
+                               Width="20" 
+                               Margin="0,0,10,0"
+                               Source="{Binding Icon}"/>
+
+                        <Label Content="{Binding FileInfo.Name}" />
+
+                    </StackPanel>
+
+
+                </DataTemplate>
+            </ListView.ItemTemplate>
+
+        </ListView>
+
+        <StackPanel Orientation="Horizontal"
+                    Grid.Column="2"
+                    Grid.Row="0"
+                    VerticalAlignment="Center">
+
+            <Label Content="Output Path: "
+                   VerticalAlignment="Center" />
+
+            <TextBox Name="OutputPathTextBox"
+                     Text="{Binding OutputFileDirectory}"
+                     VerticalAlignment="Center"
+                     Width="140" />
+
+            <Button Name="SelectOutputPathButton"
+                    Click="SelectOutputPathButton_Click"
+                    VerticalAlignment="Center"
+                    Margin="5,0,0,0"
+                    Content="Select..."
+                    Padding="5,0,5,0" />
+
+        </StackPanel>
+
+        <ListView Name="OutputRomsListView"
+                  ItemsSource="{Binding OutputRoms}"
+                  Grid.Column="3"
+                  Grid.Row="1">
+
+            <ListView.ItemTemplate>
+                <DataTemplate>
+
+                    <StackPanel Orientation="Horizontal">
+
+                        <Image Height="20"
+                               Width="20"
+                               Margin="0,0,10,0"
+                               Source="{Binding SyncStatusImage}" />
+
+                        <Image Height="20"
+                               Width="20"
+                               Margin="0,0,10,0"
+                               Source="{Binding Icon}" />
+
+                        <Label Content="{Binding FileInfo.Name}" />
+
+                    </StackPanel>
+
+
+                </DataTemplate>
+            </ListView.ItemTemplate>
+
+        </ListView>
+
+        <Button Name="SyncSelectedButton"
+                Content="Sync Selected"
+                IsEnabled="False"
+                Click="SyncSelectedButton_Click"
+                Grid.Column="0"
+                Grid.Row="2" />
+
+        <Button Name="DeleteSelectedButton"
+                Content="Delete Selected"
+                Grid.Column="2"
+                Click="DeleteSelectedButton_Click"
+                Grid.Row="2" />
+
+    </Grid>
+
+</Window>