diff --git a/.editorconfig b/.editorconfig
index 4a25f15793..2a1e9b280f 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -861,6 +861,11 @@ dotnet_diagnostic.CA1860.severity = warning
 # Prefer the 'IDictionary.TryAdd(TKey, TValue)' method.
 dotnet_diagnostic.CA1864.severity = suggestion # TODO: Change to warning once using .NET 8 or later.
 
+# Use 'string.Method(char)' instead of 'string.Method(string)' for string with single char.
+dotnet_diagnostic.CA1865.severity = suggestion # TODO: Change to warning once using .NET 8 or later.
+dotnet_diagnostic.CA1866.severity = suggestion # TODO: Change to warning once using .NET 8 or later.
+dotnet_diagnostic.CA1867.severity = suggestion # TODO: Change to warning once using .NET 8 or later.
+
 # Cache and reuse 'JsonSerializerOptions' instances.
 dotnet_diagnostic.CA1869.severity = suggestion # TODO: Change to warning once using .NET 8 or later.
 
diff --git a/OpenRA.Game/FileSystem/ZipFile.cs b/OpenRA.Game/FileSystem/ZipFile.cs
index b6c130bf9e..9aba3cabbe 100644
--- a/OpenRA.Game/FileSystem/ZipFile.cs
+++ b/OpenRA.Game/FileSystem/ZipFile.cs
@@ -144,7 +144,7 @@ namespace OpenRA.FileSystem
 
 			public ZipFolder(ReadOnlyZipFile parent, string path)
 			{
-				if (path.EndsWith("/", StringComparison.Ordinal))
+				if (path.EndsWith('/'))
 					path = path[..^1];
 
 				Name = path;
diff --git a/OpenRA.Game/MiniYaml.cs b/OpenRA.Game/MiniYaml.cs
index 2425fc9679..6320e46250 100644
--- a/OpenRA.Game/MiniYaml.cs
+++ b/OpenRA.Game/MiniYaml.cs
@@ -533,7 +533,7 @@ namespace OpenRA
 			{
 				// Append Removal nodes to the result.
 				// Therefore: we know the remainder of the method deals with a plain node.
-				if (node.Key.StartsWith("-", StringComparison.Ordinal))
+				if (node.Key.StartsWith('-'))
 				{
 					ret.Add(node);
 					return;
diff --git a/OpenRA.Mods.Common/UpdateRules/UpdateUtils.cs b/OpenRA.Mods.Common/UpdateRules/UpdateUtils.cs
index 86fc35db20..3592e7d153 100644
--- a/OpenRA.Mods.Common/UpdateRules/UpdateUtils.cs
+++ b/OpenRA.Mods.Common/UpdateRules/UpdateUtils.cs
@@ -349,7 +349,7 @@ namespace OpenRA.Mods.Common.UpdateRules
 		public static void RenameKey(this MiniYamlNodeBuilder node, string newKey, bool preserveSuffix = true, bool includeRemovals = true)
 		{
 			var prefix = includeRemovals && node.IsRemoval() ? "-" : "";
-			var split = node.Key.IndexOf("@", StringComparison.Ordinal);
+			var split = node.Key.IndexOf('@');
 			if (preserveSuffix && split > -1)
 				node.Key = prefix + newKey + node.Key[split..];
 			else