diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 81fa257..70eac23 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -59,7 +59,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-22.04, windows-2022]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "pypy3.9"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "pypy3.10"]
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
 
diff --git a/pyproject.toml b/pyproject.toml
index e99605f..ce79934 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "yt-dlp-fixupmtime"
-version = "1.1.1"
+version = "1.1.2"
 description = "A yt-dlp postprocessor plugin to set the mtime of all files to a given datetime value by key"
 requires-python = ">=3.9"
 license = { file = "LICENSE" }
diff --git a/test/test_fixup_mtime.py b/test/test_fixup_mtime.py
index ec04d48..7988094 100755
--- a/test/test_fixup_mtime.py
+++ b/test/test_fixup_mtime.py
@@ -16,19 +16,23 @@
 class TestFixupMtimePP(unittest.TestCase):
     def setUp(self):
         self.pp = FixupMtimePP()
+        self.info = {"filepath": "test äةُ한汉漢なナอัй.mp4", "upload_date": "20120101"}
 
         # Create a temporary directory of files, set their initial mtime
+        file_path = Path(self.info["filepath"])
         self.temp_dir = tempfile.mkdtemp()
         self.files = [
-            Path(self.temp_dir, filename) for filename in ["test.mp4", "test.jpg", "test.info.json", "test2.mp4"]
+            file_path,
+            file_path.with_suffix(""),
+            file_path.with_suffix(".jpg"),
+            file_path.with_suffix(".info.json"),
+            Path("test2.mp4"),
         ]
         self.initial_mtime = 1234567890.0
         for path in self.files:
             path.touch()
             os.utime(path, (self.initial_mtime, self.initial_mtime))
 
-        self.info = {"filepath": self.files[0], "upload_date": "20120101"}
-
     def tearDown(self):
         shutil.rmtree(self.temp_dir)
 
@@ -70,7 +74,7 @@ def test__strptime_or_none_with_valid_string_and_valid_format_code(self):
 
     def test__get_related_files(self):
         filepath = self.info.get("filepath")
-        expected = [path for path in self.files if path.name in ["test.mp4", "test.jpg", "test.info.json"]]
+        expected = list(filter(lambda fpath: not fpath.name.startswith("test2"), self.files))
         self.assertCountEqual(self.pp._get_related_files(filepath), expected)  # noqa: PT009
 
     def test__get_mtime_with_existing_mtime(self):
@@ -102,9 +106,10 @@ def test_run(self):
         self.pp._mtime_format = "%Y%m%d"
         expected = datetime(year=2012, month=1, day=1, tzinfo=timezone.utc).timestamp()
         self.pp.run(self.info)
-        for path in self.files[:3]:
-            assert os.path.getmtime(path) == expected
-        assert os.path.getmtime(self.files[3]) != expected
+        for file in list(filter(lambda fpath: not fpath.name.startswith("test2"), self.files)):
+            assert file.stat().st_mtime == expected
+        for file in list(filter(lambda fpath: fpath.name.startswith("test2"), self.files)):
+            assert file.stat().st_mtime != expected
 
 
 if __name__ == "__main__":
diff --git a/yt_dlp_plugins/postprocessor/fixup_mtime.py b/yt_dlp_plugins/postprocessor/fixup_mtime.py
index 05f67aa..048c146 100644
--- a/yt_dlp_plugins/postprocessor/fixup_mtime.py
+++ b/yt_dlp_plugins/postprocessor/fixup_mtime.py
@@ -11,6 +11,7 @@
 if TYPE_CHECKING:
     from collections.abc import Iterable
 
+
 from yt_dlp.postprocessor.common import PostProcessor
 from yt_dlp.utils import date_formats
 
@@ -34,7 +35,16 @@ def _strptime_or_none(self, timestamp: float | str | None, format_code: str) ->
     def _get_related_files(self, filepath: Path | str) -> list[Path]:
         if isinstance(filepath, str):
             filepath = Path(filepath)
-        return [Path(path) for path in filepath.parent.glob(f"{glob.escape(filepath.stem)}.*") if path.is_file()]
+        directory = filepath.parent
+        base_name = glob.escape(filepath.stem)
+        files_with_extension = directory.glob(f"{base_name}.*")
+        files = [fpath for fpath in files_with_extension if fpath.is_file()]
+        file_no_extension = directory / base_name
+        if file_no_extension.exists() and file_no_extension.is_file():
+            files.append(file_no_extension)
+        if filepath not in files:
+            files.insert(0, filepath)
+        return files
 
     def _get_mtime(self, filepath: Path, info: dict, mtime_key: str) -> float | int | str | None:
         return os.path.getmtime(filepath) if mtime_key == "mtime" else info.get(mtime_key)