diff --git a/build_vs2013/lc/lc.vcxproj b/build_vs2013/lc/lc.vcxproj
index 83c9fcc..b02de95 100644
--- a/build_vs2013/lc/lc.vcxproj
+++ b/build_vs2013/lc/lc.vcxproj
@@ -19,13 +19,13 @@
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   </ItemGroup>
   <ItemGroup>
-    <ClCompile Include="..\src\main.cpp" />
-  </ItemGroup>
-  <ItemGroup>
-    <ProjectReference Include="linecount_static.vcxproj">
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       <Project>{c6e64e54-0635-4a2b-b404-145ea82a761f}</Project>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="..\..\src\main.cpp" />
+  </ItemGroup>
   <PropertyGroup Label="Globals">
     <ProjectGuid>{E5D80D5A-FDE6-44FE-9E97-DF3D470DD5E9}</ProjectGuid>
     <Keyword>Win32Proj</Keyword>
diff --git a/build_vs2013/linecount/linecount.vcxproj b/build_vs2013/linecount/linecount.vcxproj
index 4a6c038..cb5516d 100644
--- a/build_vs2013/linecount/linecount.vcxproj
+++ b/build_vs2013/linecount/linecount.vcxproj
@@ -5,10 +5,24 @@
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release|Win32">
       <Configuration>Release</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="..\..\src\turbo_linecount.cpp" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\..\src\turbo_linecount.h" />
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <ProjectGuid>{76AA0AD7-A400-467D-8D9D-12D787043C0A}</ProjectGuid>
@@ -22,6 +36,12 @@
     <PlatformToolset>v120</PlatformToolset>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v120</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
@@ -29,22 +49,41 @@
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v120</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <LinkIncremental>true</LinkIncremental>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <LinkIncremental>true</LinkIncremental>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <LinkIncremental>false</LinkIncremental>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <LinkIncremental>false</LinkIncremental>
+  </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <PrecompiledHeader>
@@ -58,6 +97,19 @@
       <GenerateDebugInformation>true</GenerateDebugInformation>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;LINECOUNT_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -75,12 +127,23 @@
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     </Link>
   </ItemDefinitionGroup>
-  <ItemGroup>
-    <ClCompile Include="..\src\turbo_linecount.cpp" />
-  </ItemGroup>
-  <ItemGroup>
-    <ClInclude Include="..\src\turbo_linecount.h" />
-  </ItemGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;LINECOUNT_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+  </ItemDefinitionGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
diff --git a/build_vs2013/linecount_static/linecount_static.vcxproj b/build_vs2013/linecount_static/linecount_static.vcxproj
index 1775ea1..f467491 100644
--- a/build_vs2013/linecount_static/linecount_static.vcxproj
+++ b/build_vs2013/linecount_static/linecount_static.vcxproj
@@ -5,16 +5,24 @@
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release|Win32">
       <Configuration>Release</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
   </ItemGroup>
   <ItemGroup>
-    <ClCompile Include="..\src\turbo_linecount.cpp" />
+    <ClCompile Include="..\..\src\turbo_linecount.cpp" />
   </ItemGroup>
   <ItemGroup>
-    <ClInclude Include="..\src\turbo_linecount.h" />
+    <ClInclude Include="..\..\src\turbo_linecount.h" />
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <ProjectGuid>{C6E64E54-0635-4A2B-B404-145EA82A761F}</ProjectGuid>
@@ -28,6 +36,12 @@
     <PlatformToolset>v120</PlatformToolset>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v120</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
@@ -35,15 +49,28 @@
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v120</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup />
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
@@ -59,6 +86,19 @@
       <GenerateDebugInformation>true</GenerateDebugInformation>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -76,6 +116,23 @@
       <OptimizeReferences>true</OptimizeReferences>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+  </ItemDefinitionGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
diff --git a/build_vs2013/turbo-linecount.sln b/build_vs2013/turbo-linecount.sln
index 8e5923f..4c510b1 100644
--- a/build_vs2013/turbo-linecount.sln
+++ b/build_vs2013/turbo-linecount.sln
@@ -27,16 +27,20 @@ Global
 		{E5D80D5A-FDE6-44FE-9E97-DF3D470DD5E9}.Release|x64.Build.0 = Release|x64
 		{76AA0AD7-A400-467D-8D9D-12D787043C0A}.Debug|Win32.ActiveCfg = Debug|Win32
 		{76AA0AD7-A400-467D-8D9D-12D787043C0A}.Debug|Win32.Build.0 = Debug|Win32
-		{76AA0AD7-A400-467D-8D9D-12D787043C0A}.Debug|x64.ActiveCfg = Debug|Win32
+		{76AA0AD7-A400-467D-8D9D-12D787043C0A}.Debug|x64.ActiveCfg = Debug|x64
+		{76AA0AD7-A400-467D-8D9D-12D787043C0A}.Debug|x64.Build.0 = Debug|x64
 		{76AA0AD7-A400-467D-8D9D-12D787043C0A}.Release|Win32.ActiveCfg = Release|Win32
 		{76AA0AD7-A400-467D-8D9D-12D787043C0A}.Release|Win32.Build.0 = Release|Win32
-		{76AA0AD7-A400-467D-8D9D-12D787043C0A}.Release|x64.ActiveCfg = Release|Win32
+		{76AA0AD7-A400-467D-8D9D-12D787043C0A}.Release|x64.ActiveCfg = Release|x64
+		{76AA0AD7-A400-467D-8D9D-12D787043C0A}.Release|x64.Build.0 = Release|x64
 		{C6E64E54-0635-4A2B-B404-145EA82A761F}.Debug|Win32.ActiveCfg = Debug|Win32
 		{C6E64E54-0635-4A2B-B404-145EA82A761F}.Debug|Win32.Build.0 = Debug|Win32
-		{C6E64E54-0635-4A2B-B404-145EA82A761F}.Debug|x64.ActiveCfg = Debug|Win32
+		{C6E64E54-0635-4A2B-B404-145EA82A761F}.Debug|x64.ActiveCfg = Debug|x64
+		{C6E64E54-0635-4A2B-B404-145EA82A761F}.Debug|x64.Build.0 = Debug|x64
 		{C6E64E54-0635-4A2B-B404-145EA82A761F}.Release|Win32.ActiveCfg = Release|Win32
 		{C6E64E54-0635-4A2B-B404-145EA82A761F}.Release|Win32.Build.0 = Release|Win32
-		{C6E64E54-0635-4A2B-B404-145EA82A761F}.Release|x64.ActiveCfg = Release|Win32
+		{C6E64E54-0635-4A2B-B404-145EA82A761F}.Release|x64.ActiveCfg = Release|x64
+		{C6E64E54-0635-4A2B-B404-145EA82A761F}.Release|x64.Build.0 = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/src/turbo_linecount.cpp b/src/turbo_linecount.cpp
index d758afd..54c41f4 100644
--- a/src/turbo_linecount.cpp
+++ b/src/turbo_linecount.cpp
@@ -52,6 +52,7 @@ typedef off_t LCFILEOFFSET;
 #define LCCLOSEFILE(handle) (::close(handle) != -1)
 #define LCINVALIDHANDLE -1
 #define LCSETREALLASTERROR(err, errstr) { int __err = errno; setLastError(__err, ::strerror(__err)); }
+#define _tcsdup strdup
 
 #endif