diff --git a/BizHawk.MultiClient/MainForm.cs b/BizHawk.MultiClient/MainForm.cs
index 7ebe837991..ccb1156285 100644
--- a/BizHawk.MultiClient/MainForm.cs
+++ b/BizHawk.MultiClient/MainForm.cs
@@ -374,7 +374,12 @@ namespace BizHawk.MultiClient
 		void SNES_Check(string profile)
 		{
 			if (SNES_prepared.ContainsKey(profile)) return;
-			string exename = "libsneshawk-" + profile.ToLower() + ".exe";
+
+			string bits = "32";
+			if (Win32.Is64BitOperatingSystem)
+				bits = "64";
+
+			string exename = "libsneshawk-" + bits + "-" + profile.ToLower() + ".exe";
 
 			string thisDir = PathManager.GetExeDirectoryAbsolute();
 			string exePath = Path.Combine(thisDir, exename);
diff --git a/BizHawk.MultiClient/output/dll/libsneshawk-compatibility.exe b/BizHawk.MultiClient/output/dll/libsneshawk-32-compatibility.exe
similarity index 99%
rename from BizHawk.MultiClient/output/dll/libsneshawk-compatibility.exe
rename to BizHawk.MultiClient/output/dll/libsneshawk-32-compatibility.exe
index 9055499c25..bbe4b693fc 100644
Binary files a/BizHawk.MultiClient/output/dll/libsneshawk-compatibility.exe and b/BizHawk.MultiClient/output/dll/libsneshawk-32-compatibility.exe differ
diff --git a/BizHawk.MultiClient/output/dll/libsneshawk-performance.exe b/BizHawk.MultiClient/output/dll/libsneshawk-32-performance.exe
similarity index 99%
rename from BizHawk.MultiClient/output/dll/libsneshawk-performance.exe
rename to BizHawk.MultiClient/output/dll/libsneshawk-32-performance.exe
index cf63e5d88b..e4edaaefe3 100644
Binary files a/BizHawk.MultiClient/output/dll/libsneshawk-performance.exe and b/BizHawk.MultiClient/output/dll/libsneshawk-32-performance.exe differ
diff --git a/BizHawk.MultiClient/output/dll/libsneshawk-64-compatibility.exe b/BizHawk.MultiClient/output/dll/libsneshawk-64-compatibility.exe
new file mode 100644
index 0000000000..6bb48d1a0f
Binary files /dev/null and b/BizHawk.MultiClient/output/dll/libsneshawk-64-compatibility.exe differ
diff --git a/BizHawk.MultiClient/output/dll/libsneshawk-64-performance.exe b/BizHawk.MultiClient/output/dll/libsneshawk-64-performance.exe
new file mode 100644
index 0000000000..8412a59e7e
Binary files /dev/null and b/BizHawk.MultiClient/output/dll/libsneshawk-64-performance.exe differ
diff --git a/BizHawk.Util/Win32.cs b/BizHawk.Util/Win32.cs
index a2ef8b929b..9ba504323f 100644
--- a/BizHawk.Util/Win32.cs
+++ b/BizHawk.Util/Win32.cs
@@ -9,6 +9,38 @@ namespace BizHawk
 {
 	public static class Win32
 	{
+
+		public static bool Is64BitProcess { get { return (IntPtr.Size == 8); } }
+		public static bool Is64BitOperatingSystem { get { return Is64BitProcess || InternalCheckIsWow64(); } }
+
+		[DllImport("kernel32.dll", SetLastError = true, CallingConvention = CallingConvention.Winapi)]
+		[return: MarshalAs(UnmanagedType.Bool)]
+		private static extern bool IsWow64Process(
+				[In] IntPtr hProcess,
+				[Out] out bool wow64Process
+		);
+
+		static bool InternalCheckIsWow64()
+		{
+			if ((Environment.OSVersion.Version.Major == 5 && Environment.OSVersion.Version.Minor >= 1) ||
+					Environment.OSVersion.Version.Major >= 6)
+			{
+				using (var p = System.Diagnostics.Process.GetCurrentProcess())
+				{
+					bool retVal;
+					if (!IsWow64Process(p.Handle, out retVal))
+					{
+						return false;
+					}
+					return retVal;
+				}
+			}
+			else
+			{
+				return false;
+			}
+		}
+
 		[StructLayout(LayoutKind.Sequential, Pack = 1)]
 		public struct RECT
 		{
diff --git a/libsnes/bizwinmake.sh b/libsnes/bizwinmake.sh
index b559010cc0..29baba8541 100644
--- a/libsnes/bizwinmake.sh
+++ b/libsnes/bizwinmake.sh
@@ -1,3 +1,3 @@
 #!/bin/sh
 
-./bizwinmakeone.sh compatibility
\ No newline at end of file
+./bizwinmakeone.sh 32 compatibility
\ No newline at end of file
diff --git a/libsnes/bizwinmakedistro.sh b/libsnes/bizwinmakedistro.sh
index 314c03d272..a2de094ed4 100644
--- a/libsnes/bizwinmakedistro.sh
+++ b/libsnes/bizwinmakedistro.sh
@@ -1,12 +1,12 @@
 #!/bin/sh
 
 #makes all bsnes binaries for distribution
-#TODO - 64bit
+#use bizwinmakedistro64.sh for 64bit (dont run it at the same time!)
 
 ./bizwinclean.sh
-./bizwinmakeone.sh performance compress
+./bizwinmakeone.sh 32 performance compress
 ./bizwinclean.sh
-./bizwinmakeone.sh compatibility compress
+./bizwinmakeone.sh 32 compatibility compress
 
 #leave compatibility built as objs because thats more useful to us while devving
 
diff --git a/libsnes/bizwinmakedistro64.sh b/libsnes/bizwinmakedistro64.sh
new file mode 100644
index 0000000000..a4870e22dc
--- /dev/null
+++ b/libsnes/bizwinmakedistro64.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+#makes all bsnes binaries for distribution
+#use bizwinmakedistro64.sh for 64bit (dont run it at the same time!)
+
+./bizwinclean.sh
+./bizwinmakeone.sh 64 performance compress
+./bizwinclean.sh
+./bizwinmakeone.sh 64 compatibility compress
+
+#leave compatibility built as objs because thats more useful to us while devving
+
diff --git a/libsnes/bizwinmakeone.sh b/libsnes/bizwinmakeone.sh
index cd43121be0..7a242e4e11 100644
--- a/libsnes/bizwinmakeone.sh
+++ b/libsnes/bizwinmakeone.sh
@@ -5,22 +5,32 @@ cd bsnes
 mkdir obj
 mkdir out
 
+if [ "$1" == "64" ]; then
+	export cflags64=-m64 ;
+	export compiler=i686-w64-mingw32-c++.exe
+fi
+
+if [ "$1" == "32" ]; then
+	export cflags32=-llibco_msvc_win32 ;
+fi
+
 #debug:
 #export BIZWINCFLAGS="-I. -O0 -g -masm=intel -DLIBCO_IMPORT -DLIBCO_MSVC -static-libgcc -static-libstdc++"
 
 #not debug
-export BIZWINCFLAGS="-I. -O3 -masm=intel -static-libgcc -static-libstdc++"
+export BIZWINCFLAGS="-I. -O3 -masm=intel -static-libgcc -static-libstdc++ ${cflags64}"
 
-export TARGET_LIBSNES_LIBDEPS="-L ../libco_msvc_win32/release/ -llibco_msvc_win32  -static-libgcc -static-libstdc++ -Wl,--subsystem,windows"
-export profile=$1
+export TARGET_LIBSNES_LIBDEPS="-L ../libco_msvc_win32/release/   -static-libgcc -static-libstdc++ ${cflags64} ${cflags32} -mwindows"
+export profile=$2
+export bits=$1
 
 platform=win target=libsnes make -e -j 4
 cd ..
 
-filename=libsneshawk-${profile}.exe
+filename=libsneshawk-${bits}-${profile}.exe
 targetdir=../BizHawk.MultiClient/output/dll
 targetpath=${targetdir}/${filename}
 cp bsnes/out/${filename} ${targetdir}
-if [ "$2" == "compress" ]; then
+if [ "$3" == "compress" ]; then
 	upx -9 ${targetpath} ;
 fi
\ No newline at end of file
diff --git a/libsnes/bsnes/Makefile b/libsnes/bsnes/Makefile
index ad0b445cd5..c1b89f9102 100644
--- a/libsnes/bsnes/Makefile
+++ b/libsnes/bsnes/Makefile
@@ -37,7 +37,7 @@ else ifeq ($(platform),osx)
 else ifeq ($(platform),win)
   link += $(if $(findstring console,$(options)),-mconsole,-mwindows)
   link += -mthreads -s -luuid -lkernel32 -luser32 -lgdi32 -lcomctl32 -lcomdlg32 -lshell32 -lole32
-  link += -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc
+  link += -enable-auto-import -enable-runtime-pseudo-reloc
 else
   unknown_platform: help;
 endif
diff --git a/libsnes/bsnes/target-libsnes/Makefile b/libsnes/bsnes/target-libsnes/Makefile
index ac4e7517b5..9ebdc9bde2 100644
--- a/libsnes/bsnes/target-libsnes/Makefile
+++ b/libsnes/bsnes/target-libsnes/Makefile
@@ -20,12 +20,12 @@ obj/libsnes_pwrap.o: $(ui)/libsnes_pwrap.cpp $(ui)/*
 build: $(objects)
 ifeq ($(platform),x)
 	ar rcs out/libsnes.a $(objects)
-	$(cpp) -o out/libsnes.so -shared -Wl,-soname,libsnes.so.1 $(objects)
+	$(cpp) -o out/libsnes.so -shared -soname,libsnes.so.1 $(objects)
 else ifeq ($(platform),osx)
 	ar rcs out/libsnes.a $(objects)
 	$(cpp) -o out/libsnes.dylib -install_name @executable_path/../Libraries/libsnes.dylib -shared -dynamiclib $(objects)
 else ifeq ($(platform),win)
-	$(cpp) -o out/libsneshawk-$(profile).exe -Wl $(objects) $(TARGET_LIBSNES_LIBDEPS)
+	$(cpp) -o out/libsneshawk-$(bits)-$(profile).exe $(objects) $(TARGET_LIBSNES_LIBDEPS)
 endif
 
 install: