Add the wix we use to make the msi installer for Windows.

Wix/PintaWix.sln

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+Microsoft Visual Studio Solution File, Format Version 11.00
+# Visual Studio 2010
+Project("{930C7802-8A8C-48F9-8165-68863BCCD9DD}") = "PintaWix", "PintaWix.wixproj", "{8AF6F472-BEF2-4092-BD0F-A3017B2F5304}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x86 = Debug|x86
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8AF6F472-BEF2-4092-BD0F-A3017B2F5304}.Debug|x86.ActiveCfg = Debug|x86
+		{8AF6F472-BEF2-4092-BD0F-A3017B2F5304}.Debug|x86.Build.0 = Debug|x86
+		{8AF6F472-BEF2-4092-BD0F-A3017B2F5304}.Release|x86.ActiveCfg = Release|x86
+		{8AF6F472-BEF2-4092-BD0F-A3017B2F5304}.Release|x86.Build.0 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

Wix/PintaWix.wixproj

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+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="4.0">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
+    <ProductVersion>3.0</ProductVersion>
+    <ProjectGuid>{8af6f472-bef2-4092-bd0f-a3017b2f5304}</ProjectGuid>
+    <SchemaVersion>2.0</SchemaVersion>
+    <OutputName>Pinta</OutputName>
+    <OutputType>Package</OutputType>
+    <WixTargetsPath Condition=" '$(WixTargetsPath)' == '' AND '$(MSBuildExtensionsPath32)' != '' ">$(MSBuildExtensionsPath32)\Microsoft\WiX\v3.x\Wix.targets</WixTargetsPath>
+    <WixTargetsPath Condition=" '$(WixTargetsPath)' == '' ">$(MSBuildExtensionsPath)\Microsoft\WiX\v3.x\Wix.targets</WixTargetsPath>
+    <Name>PintaWix</Name>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
+    <OutputPath>bin\$(Configuration)\</OutputPath>
+    <IntermediateOutputPath>obj\$(Configuration)\</IntermediateOutputPath>
+    <DefineConstants>Debug</DefineConstants>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
+    <OutputPath>bin\$(Configuration)\</OutputPath>
+    <IntermediateOutputPath>obj\$(Configuration)\</IntermediateOutputPath>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="Product.wxs" />
+  </ItemGroup>
+  <ItemGroup>
+    <Folder Include="Bitmaps" />
+  </ItemGroup>
+  <ItemGroup>
+    <Content Include="Bitmaps\bannrbmp.bmp" />
+    <Content Include="Bitmaps\dlgbmp.bmp" />
+    <Content Include="Bitmaps\Pinta.ico" />
+    <Content Include="license.rtf" />
+  </ItemGroup>
+  <ItemGroup>
+    <WixExtension Include="WixUIExtension">
+      <HintPath>$(WixExtDir)\WixUIExtension.dll</HintPath>
+    </WixExtension>
+    <WixExtension Include="WixNetFxExtension">
+      <HintPath>$(WixExtDir)\WixNetFxExtension.dll</HintPath>
+    </WixExtension>
+  </ItemGroup>
+  <Import Project="$(WixTargetsPath)" />
+  <!--
+	To modify your build process, add your task inside one of the targets below and uncomment it.
+	Other similar extension points exist, see Wix.targets.
+	<Target Name="BeforeBuild">
+	</Target>
+	<Target Name="AfterBuild">
+	</Target>
+	-->
+</Project>