diff --git a/OpenRA.Game/Exts.cs b/OpenRA.Game/Exts.cs
index c99c41ea9f..f9cca3b774 100644
--- a/OpenRA.Game/Exts.cs
+++ b/OpenRA.Game/Exts.cs
@@ -27,11 +27,6 @@ namespace OpenRA
 			return string.Compare(str.ToUpperInvariant(), str, false) == 0;
 		}
 
-		public static string F(this string format, params object[] args)
-		{
-			return string.Format(format, args);
-		}
-
 		public static T WithDefault<T>(T def, Func<T> f)
 		{
 			try { return f(); }
diff --git a/OpenRA.Game/Traits/Player/FrozenActorLayer.cs b/OpenRA.Game/Traits/Player/FrozenActorLayer.cs
index e9cdc99367..2d94b06c0e 100644
--- a/OpenRA.Game/Traits/Player/FrozenActorLayer.cs
+++ b/OpenRA.Game/Traits/Player/FrozenActorLayer.cs
@@ -96,15 +96,11 @@ namespace OpenRA.Traits
 				.ToArray();
 
 			if (Footprint.Length == 0)
-				throw new ArgumentException(("This frozen actor has no footprint.\n" +
-					"Actor Name: {0}\n" +
-					"Actor Location: {1}\n" +
-					"Input footprint: [{2}]\n" +
-					"Input footprint (after shroud.Contains): [{3}]")
-					.F(actor.Info.Name,
-					actor.Location.ToString(),
-					footprint.Select(p => p.ToString()).JoinWith("|"),
-					footprint.Select(p => shroud.Contains(p).ToString()).JoinWith("|")));
+				throw new ArgumentException("This frozen actor has no footprint.\n" +
+					$"Actor Name: {actor.Info.Name}\n" +
+					$"Actor Location: {actor.Location}\n" +
+					$"Input footprint: [{footprint.Select(p => p.ToString()).JoinWith("|")}]\n" +
+					$"Input footprint (after shroud.Contains): [{footprint.Select(p => shroud.Contains(p).ToString()).JoinWith("|")}]");
 
 			CenterPosition = actor.CenterPosition;
 
diff --git a/OpenRA.Mods.Common/Scripting/Properties/CarryallProperties.cs b/OpenRA.Mods.Common/Scripting/Properties/CarryallProperties.cs
index 7426b7608c..d7af37bfe7 100644
--- a/OpenRA.Mods.Common/Scripting/Properties/CarryallProperties.cs
+++ b/OpenRA.Mods.Common/Scripting/Properties/CarryallProperties.cs
@@ -34,7 +34,7 @@ namespace OpenRA.Mods.Common.Scripting
 		{
 			var carryable = target.TraitOrDefault<Carryable>();
 			if (carryable == null)
-				throw new LuaException("Actor '{0}' cannot carry actor '{1}'!".F(Self, target));
+				throw new LuaException($"Actor '{Self}' cannot carry actor '{target}'!");
 
 			Self.QueueActivity(new PickupUnit(Self, target, carryall.Info.BeforeLoadDelay, null));
 		}
diff --git a/OpenRA.Mods.Common/Traits/World/TimeLimitManager.cs b/OpenRA.Mods.Common/Traits/World/TimeLimitManager.cs
index b87c591ea8..21b8eaeb89 100644
--- a/OpenRA.Mods.Common/Traits/World/TimeLimitManager.cs
+++ b/OpenRA.Mods.Common/Traits/World/TimeLimitManager.cs
@@ -136,7 +136,7 @@ namespace OpenRA.Mods.Common.Traits
 			if (countdownLabel != null)
 			{
 				countdown = new CachedTransform<int, string>(t =>
-					info.CountdownText.F(WidgetUtils.FormatTime(t, w.Timestep)));
+					string.Format(info.CountdownText, WidgetUtils.FormatTime(t, w.Timestep)));
 				countdownLabel.GetText = () => TimeLimit > 0 ? countdown.Update(ticksRemaining) : "";
 			}
 		}
@@ -167,7 +167,7 @@ namespace OpenRA.Mods.Common.Traits
 			{
 				if (ticksRemaining == m * 60 * ticksPerSecond)
 				{
-					TextNotificationsManager.AddSystemLine(Notification.F(m, m > 1 ? "s" : null));
+					TextNotificationsManager.AddSystemLine(string.Format(Notification, m, m > 1 ? "s" : null));
 
 					var faction = self.World.LocalPlayer?.Faction.InternalName;
 					Game.Sound.PlayNotification(self.World.Map.Rules, self.World.LocalPlayer, "Speech", info.TimeLimitWarnings[m], faction);
diff --git a/OpenRA.Mods.Common/UtilityCommands/DebugChromeRegions.cs b/OpenRA.Mods.Common/UtilityCommands/DebugChromeRegions.cs
index edfe8686c3..0e9b4e0eec 100644
--- a/OpenRA.Mods.Common/UtilityCommands/DebugChromeRegions.cs
+++ b/OpenRA.Mods.Common/UtilityCommands/DebugChromeRegions.cs
@@ -74,7 +74,7 @@ namespace OpenRA.Mods.Common.UtilityCommands
 				}
 			}
 
-			var output = HtmlTemplate.JoinWith("\n").F(zoom, Convert.ToBase64String(modData.ModFiles.Open(image).ReadAllBytes()), "[" + regions.JoinWith(",") + "]");
+			var output = string.Format(HtmlTemplate.JoinWith("\n"), zoom, Convert.ToBase64String(modData.ModFiles.Open(image).ReadAllBytes()), "[" + regions.JoinWith(",") + "]");
 			var outputPath = Path.ChangeExtension(image, ".html");
 			File.WriteAllLines(outputPath, new[] { output });
 			Console.WriteLine("Saved {0}", outputPath);
diff --git a/OpenRA.Mods.Common/Widgets/LineGraphWidget.cs b/OpenRA.Mods.Common/Widgets/LineGraphWidget.cs
index 2702fa88cf..f96ba7120c 100644
--- a/OpenRA.Mods.Common/Widgets/LineGraphWidget.cs
+++ b/OpenRA.Mods.Common/Widgets/LineGraphWidget.cs
@@ -124,7 +124,7 @@ namespace OpenRA.Mods.Common.Widgets
 
 			var scale = 200 / Math.Max(5000, (float)Math.Ceiling(maxValue / 1000) * 1000);
 
-			var widthMaxValue = labelFont.Measure(GetYAxisValueFormat().F(height / scale)).X;
+			var widthMaxValue = labelFont.Measure(string.Format(GetYAxisValueFormat(), height / scale)).X;
 			var widthLongestName = labelFont.Measure(longestName).X;
 
 			// y axis label
@@ -164,7 +164,7 @@ namespace OpenRA.Mods.Common.Widgets
 						}), 1, color);
 
 					if (lastPoint != 0f)
-						labelFont.DrawTextWithShadow(GetValueFormat().F(lastPoint), graphOrigin + new float2(lastX * xStep, -lastPoint * scale - 2),
+						labelFont.DrawTextWithShadow(string.Format(GetValueFormat(), lastPoint), graphOrigin + new float2(lastX * xStep, -lastPoint * scale - 2),
 							color, BackgroundColorDark, BackgroundColorLight, 1);
 				}
 
@@ -185,7 +185,7 @@ namespace OpenRA.Mods.Common.Widgets
 				if (n % XAxisTicksPerLabel != 0)
 					continue;
 
-				var xAxisText = GetXAxisValueFormat().F(n / XAxisTicksPerLabel);
+				var xAxisText = string.Format(GetXAxisValueFormat(), n / XAxisTicksPerLabel);
 				var xAxisTickTextWidth = labelFont.Measure(xAxisText).X;
 				var xLocation = x - xAxisTickTextWidth / 2;
 				labelFont.DrawTextWithShadow(xAxisText,
@@ -202,7 +202,7 @@ namespace OpenRA.Mods.Common.Widgets
 			{
 				var yValue = y / scale;
 				cr.DrawLine(graphOrigin + new float2(0, -y), graphOrigin + new float2(5, -y), 1, Color.White);
-				var text = GetYAxisValueFormat().F(yValue);
+				var text = string.Format(GetYAxisValueFormat(), yValue);
 
 				var textWidth = labelFont.Measure(text);
 
diff --git a/OpenRA.Mods.Common/Widgets/Logic/Ingame/IngameCashCounterLogic.cs b/OpenRA.Mods.Common/Widgets/Logic/Ingame/IngameCashCounterLogic.cs
index e91110d17e..eae08ad7da 100644
--- a/OpenRA.Mods.Common/Widgets/Logic/Ingame/IngameCashCounterLogic.cs
+++ b/OpenRA.Mods.Common/Widgets/Logic/Ingame/IngameCashCounterLogic.cs
@@ -80,7 +80,7 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 			}
 
 			siloUsageTooltip = siloUsageTooltipCache.Update((playerResources.Resources, playerResources.ResourceCapacity));
-			cashLabel.Text = cashTemplate.F(displayResources);
+			cashLabel.Text = string.Format(cashTemplate, displayResources);
 		}
 	}
 }
diff --git a/OpenRA.Mods.Common/Widgets/Logic/Ingame/ProductionTooltipLogic.cs b/OpenRA.Mods.Common/Widgets/Logic/Ingame/ProductionTooltipLogic.cs
index a8d312fbf5..f5f91ec1a1 100644
--- a/OpenRA.Mods.Common/Widgets/Logic/Ingame/ProductionTooltipLogic.cs
+++ b/OpenRA.Mods.Common/Widgets/Logic/Ingame/ProductionTooltipLogic.cs
@@ -100,7 +100,7 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 				var requiresSize = int2.Zero;
 				if (prereqs.Any())
 				{
-					requiresLabel.Text = requiresFormat.F(prereqs.JoinWith(", "));
+					requiresLabel.Text = string.Format(requiresFormat, prereqs.JoinWith(", "));
 					requiresSize = requiresFont.Measure(requiresLabel.Text);
 					requiresLabel.Visible = true;
 					descLabel.Bounds.Y = descLabelY + requiresLabel.Bounds.Height;
diff --git a/OpenRA.Mods.Common/Widgets/Logic/MainMenuLogic.cs b/OpenRA.Mods.Common/Widgets/Logic/MainMenuLogic.cs
index ecd2edcab6..c2a0c957eb 100644
--- a/OpenRA.Mods.Common/Widgets/Logic/MainMenuLogic.cs
+++ b/OpenRA.Mods.Common/Widgets/Logic/MainMenuLogic.cs
@@ -425,7 +425,7 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 				titleLabel.GetText = () => item.Title;
 
 				var authorDateTimeLabel = newsItem.Get<LabelWidget>("AUTHOR_DATETIME");
-				var authorDateTime = authorDateTimeLabel.Text.F(item.Author, item.DateTime.ToLocalTime());
+				var authorDateTime = string.Format(authorDateTimeLabel.Text, item.Author, item.DateTime.ToLocalTime());
 				authorDateTimeLabel.GetText = () => authorDateTime;
 
 				var contentLabel = newsItem.Get<LabelWidget>("CONTENT");
diff --git a/OpenRA.Mods.Common/Widgets/Logic/Settings/HotkeysSettingsLogic.cs b/OpenRA.Mods.Common/Widgets/Logic/Settings/HotkeysSettingsLogic.cs
index f9786653e1..5dfb7c7ba8 100644
--- a/OpenRA.Mods.Common/Widgets/Logic/Settings/HotkeysSettingsLogic.cs
+++ b/OpenRA.Mods.Common/Widgets/Logic/Settings/HotkeysSettingsLogic.cs
@@ -220,14 +220,14 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 			duplicateNotice.IsVisible = () => !isHotkeyValid;
 			var duplicateNoticeText = new CachedTransform<HotkeyDefinition, string>(hd =>
 				hd != null ?
-				duplicateNotice.Text.F(hd.Description, hd.Contexts.First(c => selectedHotkeyDefinition.Contexts.Contains(c))) :
+				string.Format(duplicateNotice.Text, hd.Description, hd.Contexts.First(c => selectedHotkeyDefinition.Contexts.Contains(c))) :
 				"");
 			duplicateNotice.GetText = () => duplicateNoticeText.Update(duplicateHotkeyDefinition);
 
 			var originalNotice = panel.Get<LabelWidget>("ORIGINAL_NOTICE");
 			originalNotice.TextColor = ChromeMetrics.Get<Color>("NoticeInfoColor");
 			originalNotice.IsVisible = () => isHotkeyValid && !isHotkeyDefault;
-			var originalNoticeText = new CachedTransform<HotkeyDefinition, string>(hd => originalNotice.Text.F(hd?.Default.DisplayString()));
+			var originalNoticeText = new CachedTransform<HotkeyDefinition, string>(hd => string.Format(originalNotice.Text, hd?.Default.DisplayString()));
 			originalNotice.GetText = () => originalNoticeText.Update(selectedHotkeyDefinition);
 
 			var readonlyNotice = panel.Get<LabelWidget>("READONLY_NOTICE");
diff --git a/OpenRA.Mods.Common/Widgets/SupportPowerTimerWidget.cs b/OpenRA.Mods.Common/Widgets/SupportPowerTimerWidget.cs
index d93e2052c6..12549d6c2d 100644
--- a/OpenRA.Mods.Common/Widgets/SupportPowerTimerWidget.cs
+++ b/OpenRA.Mods.Common/Widgets/SupportPowerTimerWidget.cs
@@ -57,7 +57,7 @@ namespace OpenRA.Mods.Common.Widgets
 			{
 				var self = p.Instances[0].Self;
 				var time = WidgetUtils.FormatTime(p.RemainingTicks, false, self.World.Timestep);
-				var text = Format.F(self.Owner.PlayerName, p.Info.Name, time);
+				var text = string.Format(Format, self.Owner.PlayerName, p.Info.Name, time);
 				var playerColor = self.Owner.Color;
 
 				if (Game.Settings.Game.UsePlayerStanceColors)
diff --git a/OpenRA.Platforms.Default/Texture.cs b/OpenRA.Platforms.Default/Texture.cs
index c6ae9adf67..26523fbd4f 100644
--- a/OpenRA.Platforms.Default/Texture.cs
+++ b/OpenRA.Platforms.Default/Texture.cs
@@ -96,7 +96,7 @@ namespace OpenRA.Platforms.Default
 		{
 			VerifyThreadAffinity();
 			if (!Exts.IsPowerOf2(width) || !Exts.IsPowerOf2(height))
-				throw new InvalidDataException("Non-power-of-two array {0}x{1}".F(width, height));
+				throw new InvalidDataException($"Non-power-of-two array {width}x{height}");
 
 			Size = new Size(width, height);
 			unsafe