diff --git a/BizHawk.Client.Common/BinarySaveStates.cs b/BizHawk.Client.Common/BinarySaveStates.cs
index f590441378..3d095e4c17 100644
--- a/BizHawk.Client.Common/BinarySaveStates.cs
+++ b/BizHawk.Client.Common/BinarySaveStates.cs
@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.IO;
 
 using ICSharpCode.SharpZipLib.Zip;
+//using Ionic.Zip;
 
 namespace BizHawk.Client.Common
 {
@@ -27,17 +28,8 @@ namespace BizHawk.Client.Common
 		Markers
 	}
 
-	public class BinaryStateFileNames
+	public static class BinaryStateFileNames
 	{
-		/*
-		public const string Versiontag = "BizState 1.0";
-		public const string Corestate = "Core";
-		public const string Framebuffer = "Framebuffer";
-		public const string Input = "Input Log";
-		public const string CorestateText = "CoreText";
-		public const string Movieheader = "Header";
-		*/
-
 		private static readonly Dictionary<BinaryStateLump, string> ReadNames;
 		private static readonly Dictionary<BinaryStateLump, string> WriteNames;
 
@@ -104,7 +96,6 @@ namespace BizHawk.Client.Common
 			if (!_isDisposed)
 			{
 				_isDisposed = true;
-
 				if (disposing)
 				{
 					_zip.Close();
@@ -251,7 +242,7 @@ namespace BizHawk.Client.Common
 
 	public class BinaryStateSaver : IDisposable
 	{
-		private readonly ZipOutputStream _zip;
+		private readonly IZipWriter _zip;
 		private bool _isDisposed;
 
 		private static void WriteVersion(Stream s)
@@ -267,12 +258,8 @@ namespace BizHawk.Client.Common
 		/// <param name="s">not closed when finished!</param>
 		public BinaryStateSaver(Stream s, bool stateVersionTag = true) // stateVersionTag is a hack for reusing this for movie code
 		{
-			_zip = new ZipOutputStream(s)
-				{
-					IsStreamOwner = false,
-					UseZip64 = UseZip64.Off
-				};
-			_zip.SetLevel(Global.Config.SaveStateCompressionLevelNormal);
+			_zip = new IonicZipWriter(s, Global.Config.SaveStateCompressionLevelNormal);
+			//_zip = new SharpZipWriter(s, Global.Config.SaveStateCompressionLevelNormal);
 
 			if (stateVersionTag)
 			{
@@ -283,13 +270,7 @@ namespace BizHawk.Client.Common
 		public void PutLump(BinaryStateLump lump, Action<Stream> callback)
 		{
 			var name = BinaryStateFileNames.GetWriteName(lump);
-			var e = new ZipEntry(name);
-			if (Global.Config.SaveStateCompressionLevelNormal == 0)
-				e.CompressionMethod = CompressionMethod.Stored;
-			else e.CompressionMethod = CompressionMethod.Deflated;
-			_zip.PutNextEntry(e);
-			callback(_zip);
-			_zip.CloseEntry();
+			_zip.WriteItem(name, callback);
 		}
 
 		public void PutLump(BinaryStateLump lump, Action<BinaryWriter> callback)
@@ -326,7 +307,7 @@ namespace BizHawk.Client.Common
 
 				if (disposing)
 				{
-					_zip.Close();
+					_zip.Dispose();
 				}
 			}
 		}
diff --git a/BizHawk.Client.Common/BizHawk.Client.Common.csproj b/BizHawk.Client.Common/BizHawk.Client.Common.csproj
index 21f5f4518b..85265a57d7 100644
--- a/BizHawk.Client.Common/BizHawk.Client.Common.csproj
+++ b/BizHawk.Client.Common/BizHawk.Client.Common.csproj
@@ -39,6 +39,9 @@
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\References\ICSharpCode.SharpZipLib.dll</HintPath>
     </Reference>
+    <Reference Include="Ionic.Zip">
+      <HintPath>..\References\Ionic.Zip.dll</HintPath>
+    </Reference>
     <Reference Include="LuaInterface">
       <HintPath>..\References\LuaInterface.dll</HintPath>
     </Reference>
@@ -114,7 +117,9 @@
     <Compile Include="inputAdapters\InputAdapterExtensions.cs" />
     <Compile Include="inputAdapters\InputAdapters.cs" />
     <Compile Include="inputAdapters\InputManager.cs" />
+    <Compile Include="IonicZipWriter.cs" />
     <Compile Include="IPS.cs" />
+    <Compile Include="IZipWriter.cs" />
     <Compile Include="KeyTurbo.cs" />
     <Compile Include="lua\EmuLuaLibrary.Bit.cs" />
     <Compile Include="lua\EmuLuaLibrary.Emu.cs" />
@@ -185,6 +190,7 @@
     <Compile Include="SaveSlotManager.cs" />
     <Compile Include="SavestateManager.cs" />
     <Compile Include="SevenZipSharpArchiveHandler.cs" />
+    <Compile Include="SharpZipWriter.cs" />
     <Compile Include="SystemInfo.cs" />
     <Compile Include="tools\Cheat.cs" />
     <Compile Include="tools\CheatList.cs" />
diff --git a/BizHawk.Client.Common/IZipWriter.cs b/BizHawk.Client.Common/IZipWriter.cs
new file mode 100644
index 0000000000..919de6c469
--- /dev/null
+++ b/BizHawk.Client.Common/IZipWriter.cs
@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.IO;
+
+namespace BizHawk.Client.Common
+{
+	interface IZipWriter : IDisposable
+	{
+		void WriteItem(string name, Action<Stream> callback);
+	}
+}
diff --git a/BizHawk.Client.Common/IonicZipWriter.cs b/BizHawk.Client.Common/IonicZipWriter.cs
new file mode 100644
index 0000000000..0450656134
--- /dev/null
+++ b/BizHawk.Client.Common/IonicZipWriter.cs
@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+using Ionic.Zip;
+using System.IO;
+
+namespace BizHawk.Client.Common
+{
+	public class IonicZipWriter : IZipWriter
+	{
+		private ZipOutputStream z;
+		private int level;
+
+		public IonicZipWriter(Stream s, int compressionlevel)
+		{
+			level = compressionlevel;
+			z = new ZipOutputStream(s, true)
+			{
+				EnableZip64 = Zip64Option.Never,
+				CompressionLevel = (Ionic.Zlib.CompressionLevel)level
+			};
+		}
+
+		public void WriteItem(string name, Action<Stream> callback)
+		{
+			var e = z.PutNextEntry(name);
+			if (level == 0)
+				e.CompressionMethod = CompressionMethod.None;
+			else
+				e.CompressionMethod = CompressionMethod.Deflate;
+			callback(z);
+			// there is no CloseEntry() call
+		}
+
+		public void Dispose()
+		{
+			if (z != null)
+			{
+				z.Dispose();
+				z = null;
+			}
+		}
+	}
+}
diff --git a/BizHawk.Client.Common/SharpZipWriter.cs b/BizHawk.Client.Common/SharpZipWriter.cs
new file mode 100644
index 0000000000..5277cd4ffc
--- /dev/null
+++ b/BizHawk.Client.Common/SharpZipWriter.cs
@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+using ICSharpCode.SharpZipLib.Zip;
+using System.IO;
+
+namespace BizHawk.Client.Common
+{
+	public class SharpZipWriter : IZipWriter
+	{
+		private ZipOutputStream z;
+		private int level;
+
+		public SharpZipWriter(Stream s, int compressionlevel)
+		{
+			level = compressionlevel;
+			z = new ZipOutputStream(s)
+			{
+				IsStreamOwner = false,
+				UseZip64 = UseZip64.Off
+			};
+			z.SetLevel(level);
+		}
+
+		public void WriteItem(string name, Action<Stream> callback)
+		{
+			var e = new ZipEntry(name);
+			if (level == 0)
+				e.CompressionMethod = CompressionMethod.Stored;
+			else
+				e.CompressionMethod = CompressionMethod.Deflated;
+			z.PutNextEntry(e);
+			callback(z);
+			z.CloseEntry();		
+		}
+
+		public void Dispose()
+		{
+			if (z != null)
+			{
+				z.Dispose();
+				z = null;
+			}
+		}
+	}
+}
diff --git a/References/Ionic.Zip.dll b/References/Ionic.Zip.dll
new file mode 100644
index 0000000000..95fa928855
Binary files /dev/null and b/References/Ionic.Zip.dll differ