diff --git a/src/borgstore/backends/posixfs.py b/src/borgstore/backends/posixfs.py
index e187222..52dd5af 100644
--- a/src/borgstore/backends/posixfs.py
+++ b/src/borgstore/backends/posixfs.py
@@ -201,7 +201,7 @@ def info(self, name):
         self._check_permission(name, "lr")
         try:
             st = path.stat()
-        except FileNotFoundError:
+        except (FileNotFoundError, NotADirectoryError):
             return ItemInfo(name=path.name, exists=False, directory=False, size=0)
         else:
             is_dir = stat.S_ISDIR(st.st_mode)
@@ -219,7 +219,7 @@ def load(self, name, *, size=None, offset=0):
                 if offset != 0:
                     f.seek(offset, os.SEEK_SET if offset >= 0 else os.SEEK_END)
                 return f.read(-1 if size is None else size)
-        except FileNotFoundError:
+        except (FileNotFoundError, NotADirectoryError):
             raise ObjectNotFound(name) from None
 
     def _write_to_tempfile(self, path, value, suffix=TMP_SUFFIX, do_fsync=False):
@@ -288,7 +288,7 @@ def delete(self, name):
             if self.quota_limit is not None:
                 size = path.stat().st_size
             path.unlink()
-        except FileNotFoundError:
+        except (FileNotFoundError, NotADirectoryError):
             raise ObjectNotFound(name) from None
         if self.quota_limit is not None:
             self._quota_update(-size)
@@ -344,7 +344,7 @@ def hash(self, name: str, algorithm: str = "sha256") -> str:
         try:
             with path.open("rb") as f:
                 h = hashing.file_digest(f, algorithm)
-        except FileNotFoundError:
+        except (FileNotFoundError, NotADirectoryError):
             raise ObjectNotFound(name) from None
         return h.hexdigest()
 
diff --git a/tests/test_backends.py b/tests/test_backends.py
index 85b026f..bae530b 100644
--- a/tests/test_backends.py
+++ b/tests/test_backends.py
@@ -895,6 +895,24 @@ def test_missing_nesting_dir_move(tested_backends, request):
         backend.move("namespace2/nest2/key2", "namespace2a/nest2a/key2a")
 
 
+def test_parent_is_an_object(tested_backends, request):
+    # a name below an object (not below a directory) does not exist, like on Windows, where the OS reports
+    # such a path as not found (on POSIX, it is ENOTDIR).
+    if tested_backends == "rclone_backend_created":
+        # TODO: rclone's local backend answers ENOTDIR with HTTP 500 (not 404), so we get a BackendError.
+        pytest.skip("rclone does not report a name below an object as not found")
+    with get_backend_from_fixture(tested_backends, request) as backend:
+        backend.store("key", b"value")
+        assert not backend.info("key/child").exists
+        with pytest.raises(ObjectNotFound):
+            backend.load("key/child")
+        with pytest.raises(ObjectNotFound):
+            backend.hash("key/child")
+        with pytest.raises(ObjectNotFound):
+            backend.delete("key/child")
+        assert backend.load("key") == b"value"
+
+
 def test_posixfs_missing_parent_dirs(tmp_path):
     be = PosixFS(tmp_path / "missing_parent_dir1" / "missing_parent_dir2" / "store")
     be.create()  # this should work, auto-creating the missing parent dir(s)