diff --git a/.github/workflows/python-test.yml b/.github/workflows/python-test.yml
index dddf9cf..69d518d 100644
--- a/.github/workflows/python-test.yml
+++ b/.github/workflows/python-test.yml
@@ -60,10 +60,18 @@ jobs:
     - name: Install clang-tools of pull_request event
       if: github.event_name == 'pull_request'
       run: pip install git+https://github.com/cpp-linter/clang-tools-pip.git@${{ github.head_ref }}
-    - name: Installation testing
+    - name: Install clang-tools
       run: |
         clang-tools --install ${{ matrix.version }}
         which clang-format-${{ matrix.version }}
-        clang-format-${{ matrix.version }} --version
         which clang-tidy-${{ matrix.version }}
+    - name: Check clang-tools on Windows
+      if: matrix.os == 'windows-latest'
+      run: |
+        clang-format-${{ matrix.version }}.exe --version
+        clang-tidy-${{ matrix.version }}.exe --version
+    - name: Check clang-tools on Unix
+      if: matrix.os == 'ubuntu-latest' || matrix.os == 'macos-latest'
+      run: |
+        clang-format-${{ matrix.version }} --version
         clang-tidy-${{ matrix.version }} --version
diff --git a/.gitpod.yml b/.gitpod.yml
new file mode 100644
index 0000000..df75fe2
--- /dev/null
+++ b/.gitpod.yml
@@ -0,0 +1,6 @@
+# This configuration file was automatically generated by Gitpod.
+# Please adjust to your needs (see https://www.gitpod.io/docs/config-gitpod-file)
+# and commit this file to your remote git repository to share the goodness with others.
+
+tasks:
+  - init: pip install -e .
diff --git a/clang_tools/__init__.py b/clang_tools/__init__.py
index e69de29..e0e51d1 100644
--- a/clang_tools/__init__.py
+++ b/clang_tools/__init__.py
@@ -0,0 +1,4 @@
+from clang_tools.util import check_install_os
+
+
+install_os = check_install_os()
diff --git a/clang_tools/install.py b/clang_tools/install.py
index db29504..03d6c45 100644
--- a/clang_tools/install.py
+++ b/clang_tools/install.py
@@ -5,6 +5,7 @@
 import sys
 from posixpath import basename
 
+from clang_tools import install_os
 from clang_tools.util import check_install_os
 from clang_tools.util import download_file
 
@@ -36,7 +37,6 @@ def clang_tidy_exist(version) -> bool:
 
 
 def clang_tools_binary_url(tool, version) -> string:
-    install_os = check_install_os()
     base_url = "https://github.com/muttleyxd/clang-tools-static-binaries/releases/download/master-208096c1"
     if install_os == "windows":
         download_url = f"{base_url}/{tool}-{version}_{install_os}-amd64.exe".replace(" ", "")
@@ -48,22 +48,30 @@ def clang_tools_binary_url(tool, version) -> string:
 def install_clang_format(version, directory) -> None:
     if clang_format_exist(version):
         return
-    clang_format_binary_url = clang_tools_binary_url("clang-format", version)
-    clang_format_binary = basename(clang_format_binary_url)
-    download_file(clang_format_binary_url, clang_format_binary)
-    move_and_chmod_binary(clang_format_binary, f"clang-format-{version}", directory)
+    clang_format_bin_url = clang_tools_binary_url("clang-format", version)
+    clang_format_bin = basename(clang_format_bin_url)
+    download_file(clang_format_bin_url, clang_format_bin)
+    if install_os == "windows":
+        new_clang_format_bin = f"clang-format-{version}.exe"
+    else:
+        new_clang_format_bin = f"clang-format-{version}"
+    move_and_chmod_bin(clang_format_bin, new_clang_format_bin, directory)
 
 
 def install_clang_tidy(version, directory) -> None:
     if clang_tidy_exist(version):
         return
-    clang_tidy_binary_url = clang_tools_binary_url("clang-tidy", version)
-    clang_tidy_binary = basename(clang_tidy_binary_url)
-    download_file(clang_tidy_binary_url, clang_tidy_binary)
-    move_and_chmod_binary(clang_tidy_binary, f"clang-tidy-{version}", directory)
+    clang_tidy_bin_url = clang_tools_binary_url("clang-tidy", version)
+    clang_tidy_bin = basename(clang_tidy_bin_url)
+    download_file(clang_tidy_bin_url, clang_tidy_bin)
+    if install_os == "windows":
+        new_clang_tidy_bin = f"clang-tidy-{version}.exe"
+    else:
+        new_clang_tidy_bin = f"clang-tidy-{version}"
+    move_and_chmod_bin(clang_tidy_bin, new_clang_tidy_bin, directory)
 
 
-def move_and_chmod_binary(old_file_name, new_file_name, directory) -> None:
+def move_and_chmod_bin(old_bin_name, new_bin_name, directory) -> None:
     """Move download clang-tools binary and move to bin dir with right permission."""
     if directory:
         install_dir = directory
@@ -76,12 +84,12 @@ def move_and_chmod_binary(old_file_name, new_file_name, directory) -> None:
     try:
         if not os.path.isdir(install_dir):
             os.makedirs(install_dir)
-        shutil.move(old_file_name, f"{install_dir}/{new_file_name}")
-        os.chmod(os.path.join(install_dir, new_file_name), 0o755)
+        shutil.move(old_bin_name, f"{install_dir}/{new_bin_name}")
+        os.chmod(os.path.join(install_dir, new_bin_name), 0o755)
     except PermissionError:
         raise SystemExit(
-            f"Don't have permission to install {new_file_name} to {install_dir}. \
-                Try to run with the appropriate permissions."
+            f"""Don't have permission to install {new_bin_name} to {install_dir}.
+            Try to run with the appropriate permissions."""
         )