Feature: Added support for changing the size format

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

@@ -84,5 +84,10 @@ public interface IFoldersSettingsService : IBaseSettingsService, INotifyProperty
 		/// Gets or sets a value indicating whether or not to show checkboxes when selecting items.
 		/// </summary>
 		bool ShowCheckboxesWhenSelectingItems { get; set; }
+
+		/// <summary>
+		/// Gets or sets a value indicating which format to use when displaying item sizes.
+		/// </summary>
+		SizeUnitTypes SizeUnitFormat { get; set; }
 	}
 }

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

@@ -0,0 +1,18 @@
+// Copyright (c) Files Community
+// Licensed under the MIT License.
+
+namespace Files.App.Data.Enums
+{
+	public enum SizeUnitTypes
+	{
+		/// <summary>
+		/// Displays sizes using Binary values.
+		/// </summary>
+		BinaryUnits,
+
+		/// <summary>
+		/// Displays sizes using Decimal values.
+		/// </summary>
+		DecimalUnits,
+	}
+}

src/Files.App/Data/Models/ByteSize.cs

@@ -7,6 +7,8 @@ namespace Files.App.Data.Models
 {
 	public struct ByteSize : IEquatable<ByteSize>, IComparable<ByteSize>
 	{
+		private static IFoldersSettingsService FoldersSettingsService { get; } = Ioc.Default.GetRequiredService<IFoldersSettingsService>();
+
 		private static readonly FrozenDictionary<string, string> units = new Dictionary<string, string>
 		{
 			[ByteSizeLib.ByteSize.BitSymbol] = Strings.ByteSymbol.ToLocalized(),
@@ -27,8 +29,9 @@ public struct ByteSize : IEquatable<ByteSize>, IComparable<ByteSize>
 		public ulong Bytes
 			=> (ulong)size.Bytes;
 
-		public string ShortString
-			=> $"{size.LargestWholeNumberDecimalValue:0.##} {units[size.LargestWholeNumberDecimalSymbol]}";
+		public string ShortString => FoldersSettingsService.SizeUnitFormat == SizeUnitTypes.BinaryUnits
+				? $"{size.LargestWholeNumberBinaryValue:0.##} {units[size.LargestWholeNumberBinarySymbol]}"
+				: $"{size.LargestWholeNumberDecimalValue:0.##} {units[size.LargestWholeNumberDecimalSymbol]}";
 
 		public string LongString
 			=> $"{ShortString} ({size.Bytes:#,##0} {units[ByteSizeLib.ByteSize.ByteSymbol]})";

src/Files.App/Extensions/StringExtensions.cs

@@ -1,7 +1,6 @@
 // Copyright (c) Files Community
 // Licensed under the MIT License.
 
-using ByteSizeLib;
 using Microsoft.Windows.ApplicationModel.Resources;
 using System.Collections.Concurrent;
 using System.IO;
@@ -11,6 +10,8 @@ namespace Files.App.Extensions
 {
 	public static class StringExtensions
 	{
+		private static IFoldersSettingsService FoldersSettingsService { get; } = Ioc.Default.GetRequiredService<IFoldersSettingsService>();
+
 		/// <summary>
 		/// Returns true if <paramref name="path"/> starts with the path <paramref name="baseDirPath"/>.
 		/// The comparison is case-insensitive, handles / and \ slashes as folder separators and
@@ -83,7 +84,10 @@ public static string ConvertSizeAbbreviation(this string value)
 		public static string ToSizeString(this long size) => ByteSize.FromBytes(size).ToSizeString();
 		public static string ToSizeString(this ulong size) => ByteSize.FromBytes(size).ToSizeString();
 		public static string ToSizeString(this decimal size) => ByteSize.FromBytes((double)size).ToSizeString();
-		public static string ToSizeString(this ByteSize size) => size.ToString().ConvertSizeAbbreviation();
+		public static string ToSizeString(this ByteSize size) => FoldersSettingsService.SizeUnitFormat is SizeUnitTypes.BinaryUnits
+			? size.ToBinaryString().ConvertSizeAbbreviation()
+			: size.ToString().ConvertSizeAbbreviation();
+
 
 		public static string ToLongSizeString(this long size) => ByteSize.FromBytes(size).ToLongSizeString();
 		public static string ToLongSizeString(this ulong size) => ByteSize.FromBytes(size).ToLongSizeString();

src/Files.App/Services/Settings/FoldersSettingsService.cs

@@ -107,6 +107,13 @@ public bool ShowCheckboxesWhenSelectingItems
 			set => Set(value);
 		}
 
+		/// <inheritdoc/>
+		public SizeUnitTypes SizeUnitFormat
+		{
+			get => Get(SizeUnitTypes.BinaryUnits);
+			set => Set(value);
+		}
+
 		protected override void RaiseOnSettingChangedEvent(object sender, SettingChangedEventArgs e)
 		{
 			base.RaiseOnSettingChangedEvent(sender, e);

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

@@ -4172,4 +4172,13 @@
     <value>Compare a file</value>
     <comment>Button that appears in file hash properties that allows the user to compare two files</comment>
   </data>
+  <data name="SizeFormat" xml:space="preserve">
+    <value>Size format</value>
+  </data>
+  <data name="Binary" xml:space="preserve">
+    <value>Binary</value>
+  </data>
+  <data name="Decimal" xml:space="preserve">
+    <value>Decimal</value>
+  </data>
 </root>

src/Files.App/ViewModels/Settings/FoldersViewModel.cs

@@ -8,10 +8,16 @@ public sealed partial class FoldersViewModel : ObservableObject
 		private IUserSettingsService UserSettingsService { get; } = Ioc.Default.GetRequiredService<IUserSettingsService>();
 
 
+		public Dictionary<SizeUnitTypes, string> SizeUnitsOptions { get; private set; } = [];
 
 		public FoldersViewModel()
 		{
 			SelectedDeleteConfirmationPolicyIndex = (int)DeleteConfirmationPolicy;
+
+			// Size unit format
+			SizeUnitsOptions.Add(SizeUnitTypes.BinaryUnits, Strings.Binary.GetLocalizedResource());
+			SizeUnitsOptions.Add(SizeUnitTypes.DecimalUnits, Strings.Decimal.GetLocalizedResource());
+			SizeUnitFormat = SizeUnitsOptions[UserSettingsService.FoldersSettingsService.SizeUnitFormat];
 		}
 
 		// Properties
@@ -255,5 +261,18 @@ public bool ShowCheckboxesWhenSelectingItems
 				}
 			}
 		}
+
+		private string sizeUnitFormat;
+		public string SizeUnitFormat
+		{
+			get => sizeUnitFormat;
+			set
+			{
+				if (SetProperty(ref sizeUnitFormat, value))
+				{
+					UserSettingsService.FoldersSettingsService.SizeUnitFormat = SizeUnitsOptions.First(e => e.Value == value).Key;
+				}
+			}
+		}
 	}
 }

src/Files.App/Views/Settings/FoldersPage.xaml

@@ -166,6 +166,19 @@
 				<ToggleSwitch AutomationProperties.Name="{helpers:ResourceString Name=ScrollToPreviousFolderWhenNavigatingUp}" IsOn="{x:Bind ViewModel.ScrollToPreviousFolderWhenNavigatingUp, Mode=TwoWay}" />
 			</wctcontrols:SettingsCard>
 
+			<!--  Size format  -->
+			<wctcontrols:SettingsCard Header="{helpers:ResourceString Name=SizeFormat}">
+				<wctcontrols:SettingsCard.HeaderIcon>
+					<FontIcon Glyph="&#xE67A;" />
+				</wctcontrols:SettingsCard.HeaderIcon>
+
+				<uc:ComboBoxEx
+					MinWidth="140"
+					AutomationProperties.Name="{helpers:ResourceString Name=SizeFormat}"
+					ItemsSource="{x:Bind ViewModel.SizeUnitsOptions.Values}"
+					SelectedItem="{x:Bind ViewModel.SizeUnitFormat, Mode=TwoWay}" />
+			</wctcontrols:SettingsCard>
+
 			<!--  Calculate folder sizes  -->
 			<wctcontrols:SettingsExpander Header="{helpers:ResourceString Name=CalculateFolderSizes}" IsExpanded="True">
 				<wctcontrols:SettingsExpander.HeaderIcon>