diff --git a/.github/workflows/cygwin-test.yml b/.github/workflows/cygwin-test.yml
@@ -72,7 +72,7 @@ jobs:
        python --version
        python -c 'import sys; print(sys.platform)'
        python -c 'import os; print(os.name)'
-        python -c 'import git; print(git.compat.is_win)'

    - name: Test with pytest
      run: |

diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
@@ -63,7 +63,7 @@ jobs:
        python --version
        python -c 'import sys; print(sys.platform)'
        python -c 'import os; print(os.name)'
-        python -c 'import git; print(git.compat.is_win)'

    - name: Check types with mypy
      run: |

diff --git a/git/compat.py b/git/compat.py
@@ -34,9 +34,17 @@
# ---------------------------------------------------------------------------


-is_win: bool = os.name == "nt"
is_posix = os.name == "posix"
-is_darwin = os.name == "darwin"
defenc = sys.getfilesystemencoding()



diff --git a/git/config.py b/git/config.py
@@ -7,28 +7,21 @@
"""Module containing module parser implementation able to properly read and write
configuration files."""

-import sys
import abc
from functools import wraps
import inspect
from io import BufferedReader, IOBase
import logging
import os
import re
-import fnmatch
-
-from git.compat import (
-    defenc,
-    force_text,
-    is_win,
-)

from git.util import LockFile

-import os.path as osp
-
-import configparser as cp
-
# typing-------------------------------------------------------

from typing import (
@@ -250,7 +243,7 @@ def items_all(self) -> List[Tuple[str, List[_T]]]:
def get_config_path(config_level: Lit_config_levels) -> str:
    # We do not support an absolute path of the gitconfig on Windows.
    # Use the global config instead.
-    if is_win and config_level == "system":
        config_level = "global"

    if config_level == "system":

diff --git a/git/index/fun.py b/git/index/fun.py
@@ -2,8 +2,9 @@
# NOTE: Autodoc hates it if this is a docstring.

from io import BytesIO
-from pathlib import Path
import os
from stat import (
    S_IFDIR,
    S_IFLNK,
@@ -16,26 +17,17 @@
import subprocess

from git.cmd import PROC_CREATIONFLAGS, handle_process_output
-from git.compat import (
-    defenc,
-    force_text,
-    force_bytes,
-    is_posix,
-    is_win,
-    safe_decode,
-)
-from git.exc import UnmergedEntriesError, HookExecutionError
from git.objects.fun import (
-    tree_to_stream,
    traverse_tree_recursive,
    traverse_trees_recursive,
)
from git.util import IndexFileSHA1Writer, finalize_process
from gitdb.base import IStream
from gitdb.typ import str_tree_type

-import os.path as osp
-
from .typ import BaseIndexEntry, IndexEntry, CE_NAMEMASK, CE_STAGESHIFT
from .util import pack, unpack

@@ -96,7 +88,7 @@ def run_commit_hook(name: str, index: "IndexFile", *args: str) -> None:
    env["GIT_EDITOR"] = ":"
    cmd = [hp]
    try:
-        if is_win and not _has_file_extension(hp):
            # Windows only uses extensions to determine how to open files
            # (doesn't understand shebangs). Try using bash to run the hook.
            relative_hp = Path(hp).relative_to(index.repo.working_dir).as_posix()
@@ -108,7 +100,7 @@ def run_commit_hook(name: str, index: "IndexFile", *args: str) -> None:
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            cwd=index.repo.working_dir,
-            close_fds=is_posix,
            creationflags=PROC_CREATIONFLAGS,
        )
    except Exception as ex:

diff --git a/git/index/util.py b/git/index/util.py
@@ -2,15 +2,11 @@

from functools import wraps
import os
import struct
import tempfile
from types import TracebackType

-from git.compat import is_win
-
-import os.path as osp
-
-
# typing ----------------------------------------------------------------------

from typing import Any, Callable, TYPE_CHECKING, Optional, Type
@@ -58,7 +54,7 @@ def __exit__(
        exc_tb: Optional[TracebackType],
    ) -> bool:
        if osp.isfile(self.tmp_file_path):
-            if is_win and osp.exists(self.file_path):
                os.remove(self.file_path)
            os.rename(self.tmp_file_path, self.file_path)


diff --git a/git/objects/submodule/base.py b/git/objects/submodule/base.py
@@ -7,7 +7,7 @@

import git
from git.cmd import Git
-from git.compat import defenc, is_win
from git.config import GitConfigParser, SectionConstraint, cp
from git.exc import (
    BadName,
@@ -353,9 +353,8 @@ def _write_git_file_and_module_config(cls, working_tree_dir: PathLike, module_ab
        """
        git_file = osp.join(working_tree_dir, ".git")
        rela_path = osp.relpath(module_abspath, start=working_tree_dir)
-        if is_win:
-            if osp.isfile(git_file):
-                os.remove(git_file)
        with open(git_file, "wb") as fp:
            fp.write(("gitdir: %s" % rela_path).encode(defenc))