Feature: Add Everything search & folder size calculation

src/Files.App/Data/Contracts/IGeneralSettingsService.cs

@@ -304,5 +304,20 @@ public interface IGeneralSettingsService : IBaseSettingsService, INotifyProperty
 		/// Gets or sets a value whether the filter header should be displayed.
 		/// </summary>
 		bool ShowFilterHeader { get; set; }
+
+		/// <summary>
+		/// Gets or sets the preferred search engine.
+		/// </summary>
+		PreferredSearchEngine PreferredSearchEngine { get; set; }
+
+		/// <summary>
+		/// Gets or sets a value indicating whether to use Everything for folder size calculations.
+		/// </summary>
+		bool UseEverythingForFolderSizes { get; set; }
+
+		/// <summary>
+		/// Gets or sets the maximum number of results Everything should return for folder size calculations.
+		/// </summary>
+		int EverythingMaxFolderSizeResults { get; set; }
 	}
 }

src/Files.App/Data/Enums/PreferredSearchEngine.cs

@@ -0,0 +1,21 @@
+// Copyright (c) Files Community
+// Licensed under the MIT License.
+
+namespace Files.App.Data.Enums
+{
+	/// <summary>
+	/// Defines constants that specify the preferred search engine.
+	/// </summary>
+	public enum PreferredSearchEngine
+	{
+		/// <summary>
+		/// Windows Search engine.
+		/// </summary>
+		Windows,
+
+		/// <summary>
+		/// Everything search engine.
+		/// </summary>
+		Everything,
+	}
+}

src/Files.App/Files.App.csproj

@@ -59,6 +59,15 @@
         <Content Include="7zArm64.dll">
             <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
         </Content>
+        <Content Include="Libraries\Everything32.dll">
+            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+        </Content>
+        <Content Include="Libraries\Everything64.dll">
+            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+        </Content>
+        <Content Include="Libraries\EverythingARM64.dll">
+            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+        </Content>
     </ItemGroup>
 
     <ItemGroup>

src/Files.App/GlobalUsings.cs

@@ -15,6 +15,9 @@
 global using global::System.Text.Json.Serialization;
 global using SystemIO = global::System.IO;
 
+// Microsoft Extensions
+global using global::Microsoft.Extensions.Logging;
+
 // CommunityToolkit.Mvvm
 global using global::CommunityToolkit.Mvvm.ComponentModel;
 global using global::CommunityToolkit.Mvvm.DependencyInjection;

src/Files.App/Helpers/Application/AppLifecycleHelper.cs

@@ -4,6 +4,7 @@
 using Files.App.Helpers.Application;
 using Files.App.Services.SizeProvider;
 using Files.App.Utils.Logger;
+using Files.App.Utils.Storage.Search;
 using Files.App.ViewModels.Settings;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
@@ -246,6 +247,11 @@ public static IHost ConfigureHost()
 					.AddSingleton<IStorageArchiveService, StorageArchiveService>()
 					.AddSingleton<IStorageSecurityService, StorageSecurityService>()
 					.AddSingleton<IWindowsCompatibilityService, WindowsCompatibilityService>()
+					// Search Engine Services
+					.AddSingleton<WindowsSearchEngineService>()
+					.AddSingleton<EverythingSearchEngineService>()
+					.AddSingleton<Files.App.Services.Search.IEverythingSearchService, Files.App.Services.Search.EverythingSearchService>()
+					.AddSingleton<ISearchEngineSelector, SearchEngineSelector>()
 					// ViewModels
 					.AddSingleton<MainPageViewModel>()
 					.AddSingleton<InfoPaneViewModel>()