Add build support for AMD64.
diff --git a/PCbuild/winsound.vcproj b/PCbuild/winsound.vcproj
index c1e8130..93a5ca6 100644
--- a/PCbuild/winsound.vcproj
+++ b/PCbuild/winsound.vcproj
@@ -178,6 +178,66 @@
 			<Tool
 				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
 		</Configuration>
+		<Configuration
+			Name="ReleaseAMD64|Win32"
+			OutputDirectory="."
+			IntermediateDirectory="amd64-temp-release\winsound"
+			ConfigurationType="2"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="FALSE"
+			CharacterSet="2">
+			<Tool
+				Name="VCCLCompilerTool"
+				AdditionalOptions=" /USECL:MS_OPTERON"
+				Optimization="2"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="{MSSDKPATH}\include\Win64\atl\amd64;{MSSDKPATH}\include\Win64\crt\amd64;{MSSDKPATH}\include\Win64\crt\amd64\sys;{MSSDKPATH}\include\Win64\mfc\amd64;..\Include,..\PC"
+				PreprocessorDefinitions="WIN32;NDEBUG;_WINDOWS;_USRDLL;WINSOUND_EXPORTS"
+				StringPooling="TRUE"
+				BasicRuntimeChecks="0"
+				RuntimeLibrary="2"
+				BufferSecurityCheck="FALSE"
+				EnableFunctionLevelLinking="TRUE"
+				UsePrecompiledHeader="2"
+				WarningLevel="3"
+				SuppressStartupBanner="TRUE"
+				Detect64BitPortabilityProblems="TRUE"
+				DebugInformationFormat="3"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalOptions=" /MACHINE:AMD64 /USELINK:MS_SDK"
+				AdditionalDependencies="winmm.lib"
+				OutputFile="./winsound.pyd"
+				LinkIncremental="1"
+				SuppressStartupBanner="TRUE"
+				ProgramDatabaseFile=".\./winsound.pdb"
+				BaseAddress="0x1D160000"
+				ImportLibrary=".\./winsound.lib"
+				TargetMachine="0"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
 	</Configurations>
 	<References>
 	</References>