diff --git a/OpenRA.Game/ContentInstaller.cs b/OpenRA.Game/ContentInstaller.cs
index 49763093d2..34d096f172 100644
--- a/OpenRA.Game/ContentInstaller.cs
+++ b/OpenRA.Game/ContentInstaller.cs
@@ -15,11 +15,14 @@ namespace OpenRA
 	// Referenced from ModMetadata, so needs to be in OpenRA.Game :(
 	public class ContentInstaller : IGlobalModData
 	{
+		public enum FilenameCase { Input, ForceLower, ForceUpper }
+
 		public readonly string[] TestFiles = { };
 		public readonly string[] DiskTestFiles = { };
 		public readonly string PackageToExtractFromCD = null;
 		public readonly bool OverwriteFiles = true;
 
+		public readonly FilenameCase OutputFilenameCase = FilenameCase.ForceLower;
 		public readonly Dictionary<string, string[]> CopyFilesFromCD = new Dictionary<string, string[]>();
 		public readonly Dictionary<string, string[]> ExtractFilesFromCD = new Dictionary<string, string[]>();
 
diff --git a/OpenRA.Mods.Common/InstallUtils.cs b/OpenRA.Mods.Common/InstallUtils.cs
index 92d2c9c2e8..275e72d449 100644
--- a/OpenRA.Mods.Common/InstallUtils.cs
+++ b/OpenRA.Mods.Common/InstallUtils.cs
@@ -37,9 +37,26 @@ namespace OpenRA.Mods.Common
 			return volumes.FirstOrDefault(isValidDisk);
 		}
 
+		static string GetFileName(string path, ContentInstaller.FilenameCase caseModifier)
+		{
+			// Gets the file path, splitting on both / and \
+			var index = path.LastIndexOfAny(new[] { '\\', '/' });
+			var output = path.Substring(index + 1);
+
+			switch (caseModifier)
+			{
+				case ContentInstaller.FilenameCase.ForceLower:
+					return output.ToLowerInvariant();
+				case ContentInstaller.FilenameCase.ForceUpper:
+					return output.ToUpperInvariant();
+				default:
+					return output;
+			}
+		}
+
 		// TODO: The package should be mounted into its own context to avoid name collisions with installed files
 		public static bool ExtractFromPackage(string srcPath, string package, string annotation, Dictionary<string, string[]> filesByDirectory,
-			string destPath, bool overwrite, Action<string> onProgress, Action<string> onError)
+			string destPath, bool overwrite, ContentInstaller.FilenameCase caseModifier, Action<string> onProgress, Action<string> onError)
 		{
 			Directory.CreateDirectory(destPath);
 
@@ -55,7 +72,7 @@ namespace OpenRA.Mods.Common
 				foreach (var file in directory.Value)
 				{
 					var containingDir = Path.Combine(destPath, targetDir);
-					var dest = Path.Combine(containingDir, file.ToLowerInvariant());
+					var dest = Path.Combine(containingDir, GetFileName(file, caseModifier));
 					if (File.Exists(dest))
 					{
 						if (overwrite)
@@ -83,7 +100,7 @@ namespace OpenRA.Mods.Common
 		}
 
 		public static bool CopyFiles(string srcPath, Dictionary<string, string[]> files, string destPath,
-			bool overwrite, Action<string> onProgress, Action<string> onError)
+			bool overwrite, ContentInstaller.FilenameCase caseModifier, Action<string> onProgress, Action<string> onError)
 		{
 			Directory.CreateDirectory(destPath);
 
@@ -100,9 +117,9 @@ namespace OpenRA.Mods.Common
 						return false;
 					}
 
-					var destFile = Path.GetFileName(file);
+					var destFile = GetFileName(file, caseModifier);
 					var containingDir = Path.Combine(destPath, targetDir);
-					var dest = Path.Combine(containingDir, destFile.ToLowerInvariant());
+					var dest = Path.Combine(containingDir, destFile);
 					if (File.Exists(dest) && !overwrite)
 					{
 						Log.Write("debug", "Skipping {0}".F(dest));
diff --git a/OpenRA.Mods.Common/Widgets/Logic/Installation/InstallFromCDLogic.cs b/OpenRA.Mods.Common/Widgets/Logic/Installation/InstallFromCDLogic.cs
index 1d5b2be5cf..95cf3deb31 100644
--- a/OpenRA.Mods.Common/Widgets/Logic/Installation/InstallFromCDLogic.cs
+++ b/OpenRA.Mods.Common/Widgets/Logic/Installation/InstallFromCDLogic.cs
@@ -132,7 +132,7 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 						var destFile = Platform.ResolvePath("^", "Content", modId, filename.ToLowerInvariant());
 						cabExtractor.ExtractFile(uint.Parse(archive[0]), destFile);
 						var annotation = archive.Length > 1 ? archive[1] : null;
-						InstallUtils.ExtractFromPackage(source, destFile, annotation, extractFiles, destDir, overwrite, onProgress, onError);
+						InstallUtils.ExtractFromPackage(source, destFile, annotation, extractFiles, destDir, overwrite, installData.OutputFilenameCase, onProgress, onError);
 						progressBar.Percentage += installPercent;
 					}
 				}
@@ -183,7 +183,7 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 			{
 				try
 				{
-					if (!InstallUtils.CopyFiles(source, copyFiles, dest, overwrite, onProgress, onError))
+					if (!InstallUtils.CopyFiles(source, copyFiles, dest, overwrite, installData.OutputFilenameCase, onProgress, onError))
 					{
 						onError("Copying files from CD failed.");
 						return;
@@ -191,7 +191,8 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 
 					if (!string.IsNullOrEmpty(extractPackage))
 					{
-						if (!InstallUtils.ExtractFromPackage(source, extractPackage, annotation, extractFiles, dest, overwrite, onProgress, onError))
+						if (!InstallUtils.ExtractFromPackage(source, extractPackage, annotation, extractFiles, dest,
+							overwrite, installData.OutputFilenameCase, onProgress, onError))
 						{
 							onError("Extracting files from CD failed.");
 							return;
diff --git a/mods/d2k/mod.yaml b/mods/d2k/mod.yaml
index 673230bf89..736461a12b 100644
--- a/mods/d2k/mod.yaml
+++ b/mods/d2k/mod.yaml
@@ -130,6 +130,7 @@ LoadScreen: LogoStripeLoadScreen
 	Text: Filling Crates..., Breeding Sandworms..., Fuelling carryalls..., Deploying harvesters..., Preparing 'thopters..., Summoning mentats...
 
 ContentInstaller:
+	OutputFilenameCase: ForceUpper
 # TODO: check if DATA.R8 is at 1.03 patch level with 4840 frames
 	TestFiles: ^Content/d2k/BLOXBASE.R8, ^Content/d2k/BLOXBAT.R8, ^Content/d2k/BLOXBGBS.R8, ^Content/d2k/BLOXICE.R8, ^Content/d2k/BLOXTREE.R8, ^Content/d2k/BLOXWAST.R8, ^Content/d2k/DATA.R8, ^Content/d2k/SOUND.RS, ^Content/d2k/PALETTE.BIN
 	PackageMirrorList: http://www.openra.net/packages/d2k-103-mirrors.txt