diff --git a/ruby-c-extension/sketchup-taskbarlist/TaskbarProgress/Ruby 3.1 (x64).props b/ruby-c-extension/sketchup-taskbarlist/TaskbarProgress/Ruby 3.1 (x64).props
new file mode 100644
index 0000000..7ae1e87
--- /dev/null
+++ b/ruby-c-extension/sketchup-taskbarlist/TaskbarProgress/Ruby 3.1 (x64).props	
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ImportGroup Label="PropertySheets" />
+  <PropertyGroup Label="UserMacros" />
+  <PropertyGroup />
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <AdditionalIncludeDirectories>$(SolutionDir)ThirdParty\include\ruby310\win32_x64;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+    </ClCompile>
+    <Link>
+      <AdditionalLibraryDirectories>$(SolutionDir)ThirdParty\lib\win\x64;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
+      <AdditionalDependencies>x64-msvcrt-ruby310.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup />
+</Project>
diff --git a/ruby-c-extension/sketchup-taskbarlist/TaskbarProgress/TaskbarProgress.vcxproj b/ruby-c-extension/sketchup-taskbarlist/TaskbarProgress/TaskbarProgress.vcxproj
index 26844c2..b975eef 100644
--- a/ruby-c-extension/sketchup-taskbarlist/TaskbarProgress/TaskbarProgress.vcxproj
+++ b/ruby-c-extension/sketchup-taskbarlist/TaskbarProgress/TaskbarProgress.vcxproj
@@ -21,6 +21,10 @@
       <Configuration>Debug 2.7</Configuration>
       <Platform>x64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug 3.1|x64">
+      <Configuration>Debug 3.1</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release 2.2|x64">
       <Configuration>Release 2.2</Configuration>
       <Platform>x64</Platform>
@@ -41,6 +45,10 @@
       <Configuration>Release 2.7</Configuration>
       <Platform>x64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release 3.1|x64">
+      <Configuration>Release 3.1</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <ProjectGuid>{1456285A-3D25-4B13-BF30-DBAEDEB87C22}</ProjectGuid>
@@ -80,6 +88,12 @@
     <CharacterSet>Unicode</CharacterSet>
     <PlatformToolset>v142</PlatformToolset>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug 3.1|x64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <CharacterSet>Unicode</CharacterSet>
+    <PlatformToolset>v142</PlatformToolset>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release 2.0|Win32'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
@@ -110,6 +124,12 @@
     <CharacterSet>Unicode</CharacterSet>
     <PlatformToolset>v142</PlatformToolset>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release 3.1|x64'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <CharacterSet>Unicode</CharacterSet>
+    <PlatformToolset>v142</PlatformToolset>
+  </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
@@ -134,6 +154,11 @@
     <Import Project="Ruby 2.5 (x64).props" />
   </ImportGroup>
   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug 2.7|x64'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="RubyExtension.props" />
+    <Import Project="Ruby 3.1 (x64).props" />
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug 3.1|x64'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
     <Import Project="RubyExtension.props" />
     <Import Project="Ruby 2.7 (x64).props" />
@@ -163,6 +188,11 @@
     <Import Project="RubyExtension.props" />
     <Import Project="Ruby 2.7 (x64).props" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release 3.1|x64'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="RubyExtension.props" />
+    <Import Project="Ruby 3.1 (x64).props" />
+  </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug 2.0|Win32'">
     <LinkIncremental>true</LinkIncremental>
@@ -179,6 +209,9 @@
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug 2.7|x64'">
     <LinkIncremental>true</LinkIncremental>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug 3.1|x64'">
+    <LinkIncremental>true</LinkIncremental>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release 2.0|Win32'">
     <LinkIncremental>false</LinkIncremental>
   </PropertyGroup>
@@ -194,6 +227,9 @@
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release 2.7|x64'">
     <LinkIncremental>false</LinkIncremental>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release 3.1|x64'">
+    <LinkIncremental>false</LinkIncremental>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug 2.0|Win32'">
     <LocalDebuggerCommand>$(ProgramFiles)\SketchUp\SketchUp 2014\SketchUp.exe</LocalDebuggerCommand>
     <DebuggerFlavor>WindowsLocalDebugger</DebuggerFlavor>
@@ -219,6 +255,11 @@
     <DebuggerFlavor>WindowsLocalDebugger</DebuggerFlavor>
     <LocalDebuggerCommandArguments>-RubyStartup "$(SolutionDir)/Ruby/debug.rb"</LocalDebuggerCommandArguments>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug 3.1|x64'">
+    <LocalDebuggerCommand>$(ProgramFiles)\SketchUp\SketchUp 2014\SketchUp.exe</LocalDebuggerCommand>
+    <DebuggerFlavor>WindowsLocalDebugger</DebuggerFlavor>
+    <LocalDebuggerCommandArguments>-RubyStartup "$(SolutionDir)/Ruby/debug.rb"</LocalDebuggerCommandArguments>
+  </PropertyGroup>
   <PropertyGroup>
     <ShowAllFiles>false</ShowAllFiles>
   </PropertyGroup>
@@ -247,6 +288,11 @@
     <DebuggerFlavor>WindowsLocalDebugger</DebuggerFlavor>
     <LocalDebuggerCommand>$(ProgramFiles)\SketchUp\SketchUp 2014\SketchUp.exe</LocalDebuggerCommand>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release 3.1|x64'">
+    <LocalDebuggerCommandArguments>-RubyStartup "$(SolutionDir)/Ruby/release.rb"</LocalDebuggerCommandArguments>
+    <DebuggerFlavor>WindowsLocalDebugger</DebuggerFlavor>
+    <LocalDebuggerCommand>$(ProgramFiles)\SketchUp\SketchUp 2014\SketchUp.exe</LocalDebuggerCommand>
+  </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug 2.0|Win32'">
     <ClCompile>
       <Optimization>Disabled</Optimization>
@@ -337,6 +383,24 @@
       <AdditionalIncludeDirectories>$(IntDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
     </ResourceCompile>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug 3.1|x64'">
+    <ClCompile>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_WINDOWS;_DEBUG;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+    <Midl>
+      <MkTypLibCompatible>false</MkTypLibCompatible>
+      <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </Midl>
+    <ResourceCompile>
+      <Culture>0x0409</Culture>
+      <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <AdditionalIncludeDirectories>$(IntDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+    </ResourceCompile>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release 2.0|Win32'">
     <ClCompile>
       <Optimization>MaxSpeed</Optimization>
@@ -457,6 +521,30 @@
       <AdditionalIncludeDirectories>$(IntDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
     </ResourceCompile>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release 3.1|x64'">
+    <ClCompile>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <PreprocessorDefinitions>WIN32;_WINDOWS;NDEBUG;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+    </ClCompile>
+    <Link>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+    <Midl>
+      <MkTypLibCompatible>false</MkTypLibCompatible>
+      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </Midl>
+    <ResourceCompile>
+      <Culture>0x0409</Culture>
+      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <AdditionalIncludeDirectories>$(IntDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+    </ResourceCompile>
+  </ItemDefinitionGroup>
   <ItemGroup>
     <None Include="Exports.def" />
   </ItemGroup>
diff --git a/ruby-c-extension/sketchup-taskbarlist/TestUp.sln b/ruby-c-extension/sketchup-taskbarlist/TestUp.sln
index 7fe9414..6557c61 100644
--- a/ruby-c-extension/sketchup-taskbarlist/TestUp.sln
+++ b/ruby-c-extension/sketchup-taskbarlist/TestUp.sln
@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 16
-VisualStudioVersion = 16.0.30517.126
+# Visual Studio Version 17
+VisualStudioVersion = 17.3.32929.385
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "TaskbarProgress", "TaskbarProgress\TaskbarProgress.vcxproj", "{1456285A-3D25-4B13-BF30-DBAEDEB87C22}"
 EndProject
@@ -15,6 +15,8 @@ Global
 		Debug 2.5|x64 = Debug 2.5|x64
 		Debug 2.7|Win32 = Debug 2.7|Win32
 		Debug 2.7|x64 = Debug 2.7|x64
+		Debug 3.1|Win32 = Debug 3.1|Win32
+		Debug 3.1|x64 = Debug 3.1|x64
 		Release 2.0|Win32 = Release 2.0|Win32
 		Release 2.0|x64 = Release 2.0|x64
 		Release 2.2|Win32 = Release 2.2|Win32
@@ -23,6 +25,8 @@ Global
 		Release 2.5|x64 = Release 2.5|x64
 		Release 2.7|Win32 = Release 2.7|Win32
 		Release 2.7|x64 = Release 2.7|x64
+		Release 3.1|Win32 = Release 3.1|Win32
+		Release 3.1|x64 = Release 3.1|x64
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
 		{1456285A-3D25-4B13-BF30-DBAEDEB87C22}.Debug 2.0|Win32.ActiveCfg = Debug 2.0|Win32
@@ -38,6 +42,9 @@ Global
 		{1456285A-3D25-4B13-BF30-DBAEDEB87C22}.Debug 2.7|Win32.ActiveCfg = Debug 2.7|x64
 		{1456285A-3D25-4B13-BF30-DBAEDEB87C22}.Debug 2.7|x64.ActiveCfg = Debug 2.7|x64
 		{1456285A-3D25-4B13-BF30-DBAEDEB87C22}.Debug 2.7|x64.Build.0 = Debug 2.7|x64
+		{1456285A-3D25-4B13-BF30-DBAEDEB87C22}.Debug 3.1|Win32.ActiveCfg = Debug 3.1|x64
+		{1456285A-3D25-4B13-BF30-DBAEDEB87C22}.Debug 3.1|x64.ActiveCfg = Debug 3.1|x64
+		{1456285A-3D25-4B13-BF30-DBAEDEB87C22}.Debug 3.1|x64.Build.0 = Debug 3.1|x64
 		{1456285A-3D25-4B13-BF30-DBAEDEB87C22}.Release 2.0|Win32.ActiveCfg = Release 2.0|Win32
 		{1456285A-3D25-4B13-BF30-DBAEDEB87C22}.Release 2.0|Win32.Build.0 = Release 2.0|Win32
 		{1456285A-3D25-4B13-BF30-DBAEDEB87C22}.Release 2.0|x64.ActiveCfg = Release 2.0|x64
@@ -51,6 +58,9 @@ Global
 		{1456285A-3D25-4B13-BF30-DBAEDEB87C22}.Release 2.7|Win32.ActiveCfg = Release 2.7|x64
 		{1456285A-3D25-4B13-BF30-DBAEDEB87C22}.Release 2.7|x64.ActiveCfg = Release 2.7|x64
 		{1456285A-3D25-4B13-BF30-DBAEDEB87C22}.Release 2.7|x64.Build.0 = Release 2.7|x64
+		{1456285A-3D25-4B13-BF30-DBAEDEB87C22}.Release 3.1|Win32.ActiveCfg = Release 3.1|x64
+		{1456285A-3D25-4B13-BF30-DBAEDEB87C22}.Release 3.1|x64.ActiveCfg = Release 3.1|x64
+		{1456285A-3D25-4B13-BF30-DBAEDEB87C22}.Release 3.1|x64.Build.0 = Release 3.1|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE