diff --git a/build_files/windows/autopep8.cmd b/build_files/windows/autopep8.cmd
new file mode 100644
index 00000000000..0d7929b3c25
--- /dev/null
+++ b/build_files/windows/autopep8.cmd
@@ -0,0 +1,17 @@
+if NOT EXIST %PYTHON% (
+    echo python not found, required for this operation
+    exit /b 1
+)
+
+set FORMAT_PATHS=%BLENDER_DIR%\tools\utils_maintenance\autopep8_format_paths.py
+
+for %%a in (%PYTHON%) do (
+    set PEP8_LOCATION=%%~dpa\..\lib\site-packages\autopep8.py
+)
+
+REM Use -B to avoid writing __pycache__ in lib directory and causing update conflicts.
+REM While we run with --no-subprocess a sub process is still used to get the version
+REM information, so we stil have to supply a valid --autopep8-command here.
+%PYTHON% -B %FORMAT_PATHS%  --autopep8-command "%PEP8_LOCATION%" --no-subprocess %FORMAT_ARGS%
+
+:EOF
diff --git a/build_files/windows/format.cmd b/build_files/windows/format.cmd
index d276521d83e..8b47552d26e 100644
--- a/build_files/windows/format.cmd
+++ b/build_files/windows/format.cmd
@@ -27,4 +27,6 @@ set PATH=%CF_PATH%;%PATH%
 REM Use -B to avoid writing __pycache__ in lib directory and causing update conflicts.
 %PYTHON% -B %FORMAT_PATHS% %FORMAT_ARGS%
 
+call "%~dp0\autopep8.cmd"
+
 :EOF
diff --git a/scripts/modules/bpy/utils/__init__.py b/scripts/modules/bpy/utils/__init__.py
index df34316c94d..a49aef8a905 100644
--- a/scripts/modules/bpy/utils/__init__.py
+++ b/scripts/modules/bpy/utils/__init__.py
@@ -384,6 +384,7 @@ def script_paths_system_environment():
         return [_os.path.normpath(env_system_path)]
     return []
 
+
 def script_paths(*, subdir=None, user_pref=True, check_all=False, use_user=True, use_system_environment=True):
     """
     Returns a list of valid script paths.
diff --git a/tools/utils_maintenance/autopep8_format_paths.py b/tools/utils_maintenance/autopep8_format_paths.py
index 05ea28e0461..16de5eb2769 100755
--- a/tools/utils_maintenance/autopep8_format_paths.py
+++ b/tools/utils_maintenance/autopep8_format_paths.py
@@ -30,6 +30,14 @@ from typing import (
 VERSION_MIN = (1, 6, 0)
 VERSION_MAX_RECOMMENDED = (1, 6, 0)
 AUTOPEP8_FORMAT_CMD = "autopep8"
+AUTOPEP8_FORMAT_DEFAULT_ARGS = (
+    # Operate on all directories recursively.
+    "--recursive",
+    # Update the files in-place.
+    "--in-place",
+    # Auto-detect the number of jobs to use.
+    "--jobs=0",
+)
 
 BASE_DIR = os.path.normpath(os.path.join(os.path.dirname(__file__), "..", ".."))
 os.chdir(BASE_DIR)
@@ -119,13 +127,9 @@ def autopep8_ensure_version(autopep8_format_cmd_argument: str) -> Optional[Tuple
 def autopep8_format(files: List[str]) -> bytes:
     cmd = [
         AUTOPEP8_FORMAT_CMD,
-        # Operate on all directories recursively.
-        "--recursive",
-        # Update the files in-place.
-        "--in-place",
-        # Auto-detect the number of jobs to use.
-        "--jobs=0",
-    ] + files
+        *AUTOPEP8_FORMAT_DEFAULT_ARGS,
+        *files
+    ]
 
     # Support executing from the module directory because Blender does not distribute the command.
     if cmd[0].endswith(".py"):
@@ -134,6 +138,15 @@ def autopep8_format(files: List[str]) -> bytes:
     return subprocess.check_output(cmd, stderr=subprocess.STDOUT)
 
 
+def autopep8_format_no_subprocess(files: List[str]) -> None:
+    cmd = [
+        *AUTOPEP8_FORMAT_DEFAULT_ARGS,
+        *files
+    ]
+    from autopep8 import main
+    main(argv=cmd)
+
+
 def argparse_create() -> argparse.ArgumentParser:
 
     parser = argparse.ArgumentParser(
@@ -154,6 +167,17 @@ def argparse_create() -> argparse.ArgumentParser:
         ),
         required=False,
     )
+    parser.add_argument(
+        "--no-subprocess",
+        dest="no_subprocess",
+        default=False,
+        action='store_true',
+        help=(
+            "Don't use a sub-process, load autopep8 into this instance of Python. "
+            "Works around 8191 argument length limit on WIN32."
+        ),
+        required=False,
+    )
     parser.add_argument(
         "--autopep8-command",
         dest="autopep8_command",
@@ -216,6 +240,10 @@ def main() -> None:
     if not files:
         return
 
+    if args.no_subprocess:
+        autopep8_format_no_subprocess(files)
+        return
+
     autopep8_format(files)