Add project files.

App.xaml

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+<Application x:Class="iCloud_Duplicate_Remover.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:iCloud_Duplicate_Remover"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+
+    </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 iCloud_Duplicate_Remover
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]

MainWindow.xaml

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+<Window x:Class="ImageViewerFolder.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:ImageViewerFolder"
+        mc:Ignorable="d"
+        Title="iCloud Live Photos Remover" Height="470" Width="800"
+        ResizeMode="CanMinimize">
+    <Grid Margin="10">
+
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="*"/>
+            <ColumnDefinition Width="*"/>
+        </Grid.ColumnDefinitions>
+
+        <StackPanel Grid.Column="0">
+            <!--Folder browse button-->
+            <StackPanel Margin="5,5,5,5" Orientation="Horizontal" Height="40" Background="White">
+                <Label  Height="auto" Content="Choose folder:" VerticalAlignment="Center"/>
+                <Label  x:Name="FolderDir" Height="auto"  VerticalAlignment="Center"/>
+                <Button x:Name="BrowseButton" Height="25" Width="50" Content="Browse"  Click="BrowseButton_Click"/>
+                <Button x:Name="RemoveButton" Height="25" Width="50" Content="Remove"  Click="RemoveButton_Click" Margin="5,0,0,0" Visibility="Hidden"/>
+            </StackPanel>
+
+            <!--Folder items list-->
+
+            <ListBox Margin="5,5,5,5" Height="330" x:Name="DirBox" SelectionChanged="DirBox_SelectionChanged"/>
+
+            <StackPanel Orientation="Horizontal" Margin="5,0,0,0">
+                <Label Content="Search in: "/>
+                <RadioButton Content="Root folder only" VerticalAlignment="Center" Margin="5,5,5,5" IsChecked="True" x:Name="RootOnly" Click="RootOnly_Click"/>
+                <RadioButton Content="Root and subfolders" VerticalAlignment="Center" Margin="5,5,5,5" x:Name="RootSub" Click="RootSub_Click"/>
+            </StackPanel>
+
+        </StackPanel>
+
+        <Image Grid.Column="1" Margin="5,5,5,5" x:Name="ImgBox"/>
+
+    </Grid>
+</Window>

MainWindow.xaml.cs

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+using System;
+using System.IO;
+using System.Collections.Generic;
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media.Imaging;
+using Ookii.Dialogs.Wpf;
+
+namespace ImageViewerFolder
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        private string folderPath;
+        private bool searchSubs;
+
+        private static readonly string ImageExtension = ".JPG";
+        private static readonly string MovieExtension = ".MOV";
+
+        private List<string> intersection = new();
+
+        public MainWindow()
+        {
+            InitializeComponent();
+            searchSubs = false;
+            folderPath = "TEMP_PLACEHOLDER_NULL";
+        }
+
+        private void BrowseButton_Click(object sender, RoutedEventArgs e)
+        {
+            VistaFolderBrowserDialog folderDialog = new VistaFolderBrowserDialog();
+
+            bool? result = folderDialog.ShowDialog();
+
+            if (result.HasValue && result.Value)
+            {
+                folderPath = folderDialog.SelectedPath;
+                FolderDir.Content = folderPath;
+                UpdateList();
+            }
+
+        }
+
+        private void RootOnly_Click(object sender, RoutedEventArgs e)
+        {
+            searchSubs = false;
+            if (folderPath != "TEMP_PLACEHOLDER_NULL")
+            {
+                UpdateList();
+            }
+        }
+
+        private void RootSub_Click(object sender, RoutedEventArgs e)
+        {
+            searchSubs = true;
+            if (folderPath != "TEMP_PLACEHOLDER_NULL")
+            {
+                UpdateList();
+            }
+        }
+
+        private void RemoveButton_Click(object sender, RoutedEventArgs e)
+        {
+            int count = 0;
+
+            foreach (string f in intersection)
+            {
+                System.IO.File.Delete(f + MovieExtension);
+                count++;
+                UpdateList();
+            }
+
+            string info = "Removed: " + count.ToString() + " movies.";
+            _ = MessageBox.Show(info);
+        }
+
+        private void DirBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            ImgBox.Source = null;
+            if (DirBox.Items.Count > 0)
+            {
+                string imgPath = e.AddedItems[0].ToString();
+
+                BitmapImage bitmap = new();
+                bitmap.BeginInit();
+                bitmap.UriSource = new Uri(imgPath);
+                bitmap.EndInit();
+
+                ImgBox.Source = bitmap;
+            }
+        }
+
+        private void UpdateList()
+        {
+            DirBox.Items.Clear();
+
+            List<string> imgList = new List<string>();
+            List<string> movList = new List<string>();
+
+            List<string> files = new List<string>();
+
+            try
+            {
+
+                if (!searchSubs)
+                {
+                    files = Directory.GetFiles(folderPath).ToList();
+                }
+
+                if (searchSubs)
+                {
+                    files = Directory.GetFiles(folderPath, "*", SearchOption.AllDirectories).ToList();
+                }
+
+                foreach (string f in files.ToList())
+                {
+
+                    if (ImageExtension.Contains(System.IO.Path.GetExtension(f).ToUpperInvariant()))
+                    {
+                        imgList.Add(f.Split('.')[0]);
+                    }
+                    else if (MovieExtension.Contains(System.IO.Path.GetExtension(f).ToUpperInvariant()))
+                    {
+                        movList.Add(f.Split('.')[0]);
+                    }
+                }
+
+                intersection = imgList.Select(i => i.ToString()).Intersect(movList).ToList();
+
+
+                foreach (var f in intersection)
+                {
+                    _ = DirBox.Items.Add(f + ".JPG");
+                }
+
+                if (DirBox.Items.Count > 0)
+                    RemoveButton.Visibility = Visibility.Visible;
+                else
+                    RemoveButton.Visibility = Visibility.Hidden;
+
+
+            }
+            catch (UnauthorizedAccessException)
+            {
+                _ = MessageBox.Show($"UnauthorizedAccessException");
+            }
+
+        }
+    }
+}

iCloud Duplicate Remover.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net5.0-windows</TargetFramework>
+    <RootNamespace>iCloud_Duplicate_Remover</RootNamespace>
+    <UseWPF>true</UseWPF>
+    <ApplicationIcon>iCloud.ico</ApplicationIcon>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Ookii.Dialogs.Wpf" Version="3.1.0" />
+  </ItemGroup>
+
+</Project>

iCloud Duplicate Remover.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31424.327
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "iCloud Duplicate Remover", "iCloud Duplicate Remover.csproj", "{2685835E-839D-491E-BE05-574A897717A2}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{2685835E-839D-491E-BE05-574A897717A2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{2685835E-839D-491E-BE05-574A897717A2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{2685835E-839D-491E-BE05-574A897717A2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{2685835E-839D-491E-BE05-574A897717A2}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {70EBD273-8551-45E7-A645-46B4B334BE70}
+	EndGlobalSection
+EndGlobal