diff --git a/.github/actions/install-graphviz/action.yaml b/.github/actions/install-graphviz/action.yaml
new file mode 100644
index 0000000..1f5371f
--- /dev/null
+++ b/.github/actions/install-graphviz/action.yaml
@@ -0,0 +1,30 @@
+name: InstallGraphviz
+
+runs:
+  using: "composite"
+  steps:
+    - name: Install Graphviz on Windows
+      if: runner.os == 'Windows'
+      run: |
+          choco install graphviz -y
+          echo "C:\\Program Files\\Graphviz\\bin" >> "$GITHUB_PATH"
+      shell: bash
+
+    - name: Install Graphviz on Linux
+      if: runner.os == 'Linux'
+      run: |
+          sudo apt-get install graphviz
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
+      shell: bash
+
+    - name: Install Graphviz on macOS
+      if: runner.os == 'macOS'
+      run: |
+          brew install graphviz
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
+      shell: bash
+
+    - name: SelfTest run dot
+      run: |
+          dot -V
+      shell: bash      
diff --git a/.github/workflows/dotnet.yml b/.github/workflows/dotnet.yml
index 3e2e893..5f524f9 100644
--- a/.github/workflows/dotnet.yml
+++ b/.github/workflows/dotnet.yml
@@ -25,6 +25,8 @@ jobs:
       uses: actions/setup-dotnet@v4
       with:
         dotnet-version: ${{ matrix.dotnet-version }}
+    - name: Install GraphViz ${{ matrix.dotnet-version }}
+      uses: ./.github/actions/install-graphviz
     - name: Restore dependencies
       run: dotnet restore
     - name: Test
@@ -34,4 +36,4 @@ jobs:
       with:
         name: dotnet-results-${{ matrix.dotnet-version }}-${{ matrix.os }}
         path: TestResults-${{ matrix.dotnet-version }}-${{ matrix.os }}
-      if: ${{ always() }}
\ No newline at end of file
+      if: ${{ always() }}
diff --git a/ExtensibleParaser/ExtensibleParaser.csproj b/ExtensibleParaser/ExtensibleParaser.csproj
index 098146f..f0c1f16 100644
--- a/ExtensibleParaser/ExtensibleParaser.csproj
+++ b/ExtensibleParaser/ExtensibleParaser.csproj
@@ -22,7 +22,4 @@
         <ProjectReference Include="..\Regex\Regex\Regex.csproj" />
     </ItemGroup>
 
-    <ItemGroup>
-      <Folder Include="Shared\" />
-    </ItemGroup>
 </Project>
diff --git a/Parsers/Dot/DotParser/DotParser.csproj b/Parsers/Dot/DotParser/DotParser.csproj
index 385e11e..57a3383 100644
--- a/Parsers/Dot/DotParser/DotParser.csproj
+++ b/Parsers/Dot/DotParser/DotParser.csproj
@@ -18,9 +18,4 @@
         <ProjectReference Include="..\..\..\TerminalGenerator\TerminalGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
     </ItemGroup>
 
-    <ItemGroup>
-      <Folder Include="Shared\" />
-      <Folder Include="Shared\" />
-    </ItemGroup>
-
 </Project>
diff --git a/Regex/Regex/Dot.cs b/Regex/Regex/Dot.cs
index 0ab7a8d..3cc21af 100644
--- a/Regex/Regex/Dot.cs
+++ b/Regex/Regex/Dot.cs
@@ -19,7 +19,7 @@ public static void GenerateSvg(string dotFilePath, string outputSvgPath)
     {
         var processStartInfo = new ProcessStartInfo
         {
-            FileName = "dot.exe",
+            FileName = "dot",
             Arguments = $"-Tsvg \"{dotFilePath}\" -o \"{outputSvgPath}\"",
             RedirectStandardOutput = true,
             RedirectStandardError = true,
diff --git a/Regex/Regex/Regex.csproj b/Regex/Regex/Regex.csproj
index 2be4451..83430c4 100644
--- a/Regex/Regex/Regex.csproj
+++ b/Regex/Regex/Regex.csproj
@@ -19,8 +19,4 @@
     </PackageReference>
   </ItemGroup>-->
 
-  <ItemGroup>
-    <Folder Include="Shared\" />
-  </ItemGroup>
-
 </Project>
diff --git a/Tests/ParaserTests/ParaserTests.csproj b/Tests/ParaserTests/ParaserTests.csproj
index 4b2d56b..a970dc8 100644
--- a/Tests/ParaserTests/ParaserTests.csproj
+++ b/Tests/ParaserTests/ParaserTests.csproj
@@ -32,8 +32,4 @@
 
   </ItemGroup>
 
-  <ItemGroup>
-    <Folder Include="Shared\" />
-  </ItemGroup>
-
 </Project>
diff --git a/Tests/RegexTests/RegexTests.cs b/Tests/RegexTests/RegexTests.cs
index d507d9f..ef943cc 100644
--- a/Tests/RegexTests/RegexTests.cs
+++ b/Tests/RegexTests/RegexTests.cs
@@ -14,7 +14,7 @@ public void Setup()
         Trace.AutoFlush = true;
     }
 
-    [TestMethod, Ignore]
+    [TestMethod]
     public void DfaConstruction_3()
     {
         var pattern = @"(//[^\n]*(\n|$)|\s)*";
diff --git a/Tests/RegexTests/RegexTests.csproj b/Tests/RegexTests/RegexTests.csproj
index c076953..4ee3950 100644
--- a/Tests/RegexTests/RegexTests.csproj
+++ b/Tests/RegexTests/RegexTests.csproj
@@ -19,8 +19,4 @@
 
     </ItemGroup>
 
-    <ItemGroup>
-        <Folder Include="Shared\" />
-    </ItemGroup>
-
 </Project>