Feature: Display error message when transferring files that are too large for FAT32

src/Files.App/Dialogs/FileTooLargeDialog.xaml

@@ -0,0 +1,36 @@
+<!--  Copyright (c) 2023 Files Community. Licensed under the MIT License. See the LICENSE.  -->
+<ContentDialog
+	x:Class="Files.App.Dialogs.FileTooLargeDialog"
+	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:helpers="using:Files.App.Helpers"
+	xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+	Title="{helpers:ResourceString Name=StatusCopyFailed}"
+	CornerRadius="{StaticResource OverlayCornerRadius}"
+	DefaultButton="Primary"
+	PrimaryButtonText="{helpers:ResourceString Name=OK}"
+	RequestedTheme="{x:Bind helpers:ThemeHelper.RootTheme}"
+	Style="{StaticResource DefaultContentDialogStyle}"
+	mc:Ignorable="d">
+
+	<StackPanel Spacing="4">
+		<TextBlock Text="{x:Bind ViewModel.ListHeader}" />
+
+		<ListView
+			MaxHeight="300"
+			ItemsSource="{x:Bind ViewModel.Paths}"
+			SelectionMode="None">
+			<ListView.ItemTemplate>
+				<DataTemplate x:DataType="x:String">
+					<TextBlock
+						Padding="4"
+						IsTabStop="False"
+						Text="{x:Bind}"
+						TextWrapping="Wrap" />
+				</DataTemplate>
+			</ListView.ItemTemplate>
+		</ListView>
+	</StackPanel>
+
+</ContentDialog>

src/Files.App/Dialogs/FileTooLargeDialog.xaml.cs

@@ -0,0 +1,35 @@
+// Copyright (c) 2023 Files Community
+// Licensed under the MIT License. See the LICENSE.
+
+using Microsoft.UI.Xaml.Controls;
+
+namespace Files.App.Dialogs
+{
+	public sealed partial class FileTooLargeDialog : ContentDialog, IDialog<FileTooLargeDialogViewModel>
+	{
+		public FileTooLargeDialogViewModel ViewModel
+		{
+			get => (FileTooLargeDialogViewModel)DataContext;
+			set => DataContext = value;
+		}
+
+		public FileTooLargeDialog()
+		{
+			InitializeComponent();
+		}
+
+		public new async Task<DialogResult> ShowAsync()
+		{
+			return (DialogResult)await SetContentDialogRoot(this).TryShowAsync();
+		}
+
+		// WINUI3
+		private ContentDialog SetContentDialogRoot(ContentDialog contentDialog)
+		{
+			if (Windows.Foundation.Metadata.ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 8))
+				contentDialog.XamlRoot = MainWindow.Instance.Content.XamlRoot;
+
+			return contentDialog;
+		}
+	}
+}

src/Files.App/Services/DialogService.cs

@@ -32,6 +32,7 @@ public DialogService()
 				{ typeof(ReorderSidebarItemsDialogViewModel), () => new ReorderSidebarItemsDialog() },
 				{ typeof(AddBranchDialogViewModel), () => new AddBranchDialog() },
 				{ typeof(GitHubLoginDialogViewModel), () => new GitHubLoginDialog() },
+				{ typeof(FileTooLargeDialogViewModel), () => new FileTooLargeDialog() },
 			};
 		}
 

src/Files.App/Strings/en-US/Resources.resw

@@ -3429,4 +3429,7 @@
   <data name="ShortcutItemWorkingDir" xml:space="preserve">
     <value>Start in:</value>
   </data>
+  <data name="FileTooLargeHeader" xml:space="preserve">
+    <value>The following files are too big to be copied on ({0}):</value>
+  </data>
 </root>

src/Files.App/Utils/Storage/Operations/ShellFilesystemOperations.cs

@@ -166,6 +166,17 @@ await sourceMatch.Select(x => x.dest).ToListAsync(),
 								await sourceMatch.Select(x => FileNameConflictResolveOptionType.ReplaceExisting).ToListAsync(), progress, cancellationToken);
 					}
 				}
+				else if (copyResult.Items.Any(x => CopyEngineResult.Convert(x.HResult) == FileSystemStatusCode.FileTooLarge))
+				{
+					var failingItems = copyResult.Items
+						.Where(x => CopyEngineResult.Convert(x.HResult) == FileSystemStatusCode.FileTooLarge)
+						.Select(item => item.Source);
+
+					await Ioc.Default.GetRequiredService<IDialogService>().ShowDialogAsync(new FileTooLargeDialogViewModel(
+						string.Format("FileTooLargeHeader".GetLocalizedResource(), Path.GetPathRoot(copyResult.Items.First().Destination)),
+						failingItems
+					));
+				}
 				// ADS
 				else if (copyResult.Items.All(x => x.HResult == -1))
 				{

src/Files.Core/Data/Enums/CopyEngineResult.cs

@@ -36,7 +36,7 @@ public struct CopyEngineResult
 		public const int COPYENGINE_E_ALREADY_EXISTS_SYSTEM = -2144927701;
 		public const int COPYENGINE_E_ALREADY_EXISTS_FOLDER = -2144927700;
 		// File too big
-		//public const int COPYENGINE_E_FILE_TOO_LARGE = -2144927731;
+		public const int COPYENGINE_E_FILE_TOO_LARGE = -2144927731;
 		//public const int COPYENGINE_E_REMOVABLE_FULL = -2144927730;
 		//public const int COPYENGINE_E_DISK_FULL = -2144927694;
 		//public const int COPYENGINE_E_DISK_FULL_CLEAN = -2144927693;
@@ -78,6 +78,7 @@ public static FileSystemStatusCode Convert(int? hres)
 				CopyEngineResult.COPYENGINE_E_ALREADY_EXISTS_READONLY => FileSystemStatusCode.AlreadyExists,
 				CopyEngineResult.COPYENGINE_E_ALREADY_EXISTS_SYSTEM => FileSystemStatusCode.AlreadyExists,
 				CopyEngineResult.COPYENGINE_E_ALREADY_EXISTS_FOLDER => FileSystemStatusCode.AlreadyExists,
+				CopyEngineResult.COPYENGINE_E_FILE_TOO_LARGE => FileSystemStatusCode.FileTooLarge,
 				CopyEngineResult.COPYENGINE_E_FILE_IS_FLD_DEST => FileSystemStatusCode.NotAFile,
 				CopyEngineResult.COPYENGINE_E_FLD_IS_FILE_DEST => FileSystemStatusCode.NotAFolder,
 				CopyEngineResult.COPYENGINE_E_SHARING_VIOLATION_SRC => FileSystemStatusCode.InUse,

src/Files.Core/Data/Enums/FileSystemStatusCode.cs

@@ -64,6 +64,11 @@ public enum FileSystemStatusCode
 		/// <summary>
 		/// InProgress
 		/// </summary>
-		InProgress = 1024
+		InProgress = 1024,
+
+		/// <summary>
+		/// FileTooLarge
+		/// </summary>
+		FileTooLarge = 2048
 	}
 }

src/Files.Core/ViewModels/Dialogs/FileTooLargeDialogViewModel.cs

@@ -0,0 +1,18 @@
+// Copyright (c) 2023 Files Community
+// Licensed under the MIT License. See the LICENSE.
+
+namespace Files.Core.ViewModels.Dialogs
+{
+	public sealed class FileTooLargeDialogViewModel: ObservableObject
+	{
+		public string ListHeader { get; private set; }
+
+		public IEnumerable<string> Paths { get; private set; }
+
+		public FileTooLargeDialogViewModel(string listHeader, IEnumerable<string> paths) 
+		{ 
+			ListHeader = listHeader;
+			Paths = paths;
+		}
+	}
+}