diff --git a/OpenRA.Game/Game.cs b/OpenRA.Game/Game.cs
index fde21b6c23..ce6a8ee535 100644
--- a/OpenRA.Game/Game.cs
+++ b/OpenRA.Game/Game.cs
@@ -363,7 +363,7 @@ namespace OpenRA
 				return;
 			}
 
-			ModData.InitializeLoaders();
+			ModData.InitializeLoaders(ModData.DefaultFileSystem);
 			Renderer.InitializeFonts(ModData);
 
 			if (Cursor != null)
diff --git a/OpenRA.Game/Graphics/VoxelLoader.cs b/OpenRA.Game/Graphics/VoxelLoader.cs
index 4153134c32..ab0b7a1135 100644
--- a/OpenRA.Game/Graphics/VoxelLoader.cs
+++ b/OpenRA.Game/Graphics/VoxelLoader.cs
@@ -13,6 +13,7 @@ using System.Collections.Generic;
 using System.Drawing;
 using System.Linq;
 using OpenRA.FileFormats;
+using OpenRA.FileSystem;
 using OpenRA.Primitives;
 
 namespace OpenRA.Graphics
@@ -37,6 +38,7 @@ namespace OpenRA.Graphics
 
 		readonly List<Vertex[]> vertices = new List<Vertex[]>();
 		readonly Cache<Pair<string, string>, Voxel> voxels;
+		readonly IReadOnlyFileSystem fileSystem;
 		IVertexBuffer<Vertex> vertexBuffer;
 		int totalVertexCount;
 		int cachedVertexCount;
@@ -57,8 +59,9 @@ namespace OpenRA.Graphics
 			return new SheetBuilder(SheetType.DualIndexed, allocate);
 		}
 
-		public VoxelLoader()
+		public VoxelLoader(IReadOnlyFileSystem fileSystem)
 		{
+			this.fileSystem = fileSystem;
 			voxels = new Cache<Pair<string, string>, Voxel>(LoadFile);
 			vertices = new List<Vertex[]>();
 			totalVertexCount = 0;
@@ -218,9 +221,9 @@ namespace OpenRA.Graphics
 		{
 			VxlReader vxl;
 			HvaReader hva;
-			using (var s = Game.ModData.ModFiles.Open(files.First + ".vxl"))
+			using (var s = fileSystem.Open(files.First + ".vxl"))
 				vxl = new VxlReader(s);
-			using (var s = Game.ModData.ModFiles.Open(files.Second + ".hva"))
+			using (var s = fileSystem.Open(files.Second + ".hva"))
 				hva = new HvaReader(s, files.Second + ".hva");
 			return new Voxel(this, vxl, hva);
 		}
diff --git a/OpenRA.Game/Graphics/VoxelProvider.cs b/OpenRA.Game/Graphics/VoxelProvider.cs
index 87e8131c55..e63aa2c3b2 100644
--- a/OpenRA.Game/Graphics/VoxelProvider.cs
+++ b/OpenRA.Game/Graphics/VoxelProvider.cs
@@ -12,6 +12,7 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using OpenRA.FileSystem;
 
 namespace OpenRA.Graphics
 {
@@ -19,20 +20,20 @@ namespace OpenRA.Graphics
 	{
 		static Dictionary<string, Dictionary<string, Voxel>> units;
 
-		public static void Initialize(ModData modData, string[] voxelFiles, List<MiniYamlNode> voxelNodes)
+		public static void Initialize(VoxelLoader loader, IReadOnlyFileSystem fileSystem, string[] voxelFiles, List<MiniYamlNode> voxelNodes)
 		{
 			units = new Dictionary<string, Dictionary<string, Voxel>>();
 
 			var sequences = MiniYaml.Merge(voxelFiles.Select(
-				s => MiniYaml.FromStream(modData.ModFiles.Open(s))));
+				s => MiniYaml.FromStream(fileSystem.Open(s))));
 
 			foreach (var s in sequences)
-				LoadVoxelsForUnit(s.Key, s.Value);
+				LoadVoxelsForUnit(loader, s.Key, s.Value);
 
-			Game.ModData.VoxelLoader.RefreshBuffer();
+			loader.RefreshBuffer();
 		}
 
-		static Voxel LoadVoxel(string unit, MiniYaml info)
+		static Voxel LoadVoxel(VoxelLoader voxelLoader, string unit, MiniYaml info)
 		{
 			var vxl = unit;
 			var hva = unit;
@@ -46,15 +47,15 @@ namespace OpenRA.Graphics
 					hva = fields[1].Trim();
 			}
 
-			return Game.ModData.VoxelLoader.Load(vxl, hva);
+			return voxelLoader.Load(vxl, hva);
 		}
 
-		static void LoadVoxelsForUnit(string unit, MiniYaml sequences)
+		static void LoadVoxelsForUnit(VoxelLoader loader, string unit, MiniYaml sequences)
 		{
 			Game.ModData.LoadScreen.Display();
 			try
 			{
-				var seq = sequences.ToDictionary(my => LoadVoxel(unit, my));
+				var seq = sequences.ToDictionary(my => LoadVoxel(loader, unit, my));
 				units.Add(unit, seq);
 			}
 			catch (FileNotFoundException) { } // Do nothing; we can crash later if we actually wanted art
diff --git a/OpenRA.Game/ModData.cs b/OpenRA.Game/ModData.cs
index 996694d1d6..a985c04db9 100644
--- a/OpenRA.Game/ModData.cs
+++ b/OpenRA.Game/ModData.cs
@@ -85,7 +85,7 @@ namespace OpenRA
 				LoadScreen.Display();
 		}
 
-		public void InitializeLoaders()
+		public void InitializeLoaders(IReadOnlyFileSystem fileSystem)
 		{
 			// all this manipulation of static crap here is nasty and breaks
 			// horribly when you use ModData in unexpected ways.
@@ -94,7 +94,7 @@ namespace OpenRA
 
 			if (VoxelLoader != null)
 				VoxelLoader.Dispose();
-			VoxelLoader = new VoxelLoader();
+			VoxelLoader = new VoxelLoader(fileSystem);
 
 			CursorProvider = new CursorProvider(this);
 		}
@@ -164,11 +164,12 @@ namespace OpenRA
 
 			// Operate on a copy of the map to avoid gameplay state leaking into the cache
 			var map = new Map(MapCache[uid].Path);
+			var fileSystem = DefaultFileSystem;
 
 			LoadTranslations(map);
 
 			// Reinitialize all our assets
-			InitializeLoaders();
+			InitializeLoaders(fileSystem);
 			ModFiles.LoadFromManifest(Manifest);
 
 			// Mount map package so custom assets can be used.
@@ -182,9 +183,9 @@ namespace OpenRA
 			// Load music with map assets mounted
 			using (new Support.PerfTimer("Map.Music"))
 				foreach (var entry in map.Rules.Music)
-					entry.Value.Load(DefaultFileSystem);
+					entry.Value.Load(fileSystem);
 
-			VoxelProvider.Initialize(this, Manifest.VoxelSequences, map.VoxelSequenceDefinitions);
+			VoxelProvider.Initialize(VoxelLoader, fileSystem, Manifest.VoxelSequences, map.VoxelSequenceDefinitions);
 			VoxelLoader.Finish();
 
 			return map;