diff --git a/aider/coders/base_coder.py b/aider/coders/base_coder.py
index 8a7c5b3ff..72d222a52 100755
--- a/aider/coders/base_coder.py
+++ b/aider/coders/base_coder.py
@@ -1062,13 +1062,14 @@ class Coder:
         mentioned_rel_fnames = set()
         fname_to_rel_fnames = {}
         for rel_fname in addable_rel_fnames:
-            if rel_fname in words:
+            normalized_rel_fname = rel_fname.replace('\\', '/')
+            if normalized_rel_fname in words or rel_fname in words:
                 mentioned_rel_fnames.add(str(rel_fname))
 
             fname = os.path.basename(rel_fname)
 
             # Don't add basenames that could be plain words like "run" or "make"
-            if "/" in fname or "." in fname or "_" in fname or "-" in fname:
+            if "/" in fname or "\\" in fname or "." in fname or "_" in fname or "-" in fname:
                 if fname not in fname_to_rel_fnames:
                     fname_to_rel_fnames[fname] = []
                 fname_to_rel_fnames[fname].append(rel_fname)
diff --git a/tests/basic/test_coder.py b/tests/basic/test_coder.py
index 84c483836..35f99c501 100644
--- a/tests/basic/test_coder.py
+++ b/tests/basic/test_coder.py
@@ -205,6 +205,37 @@ class TestCoder(unittest.TestCase):
 
             self.assertEqual(coder.abs_fnames, set([str(fname.resolve())]))
 
+    def test_get_file_mentions_path_formats(self):
+        with GitTemporaryDirectory():
+            io = InputOutput(pretty=False, yes=True)
+            coder = Coder.create(self.GPT35, None, io)
+
+            # Test cases with different path formats
+            test_cases = [
+                # Unix paths in content, Unix paths in get_addable_relative_files
+                ("Check file1.txt and dir/file2.txt", ["file1.txt", "dir/file2.txt"]),
+                # Windows paths in content, Windows paths in get_addable_relative_files
+                ("Check file1.txt and dir\\file2.txt", ["file1.txt", "dir\\file2.txt"]),
+                # Unix paths in content, Windows paths in get_addable_relative_files
+                ("Check file1.txt and dir/file2.txt", ["file1.txt", "dir\\file2.txt"]),
+                # Windows paths in content, Unix paths in get_addable_relative_files
+                ("Check file1.txt and dir\\file2.txt", ["file1.txt", "dir/file2.txt"]),
+                # Mixed paths in content, Unix paths in get_addable_relative_files
+                ("Check file1.txt, dir/file2.txt, and other\\file3.txt", 
+                 ["file1.txt", "dir/file2.txt", "other/file3.txt"]),
+                # Mixed paths in content, Windows paths in get_addable_relative_files
+                ("Check file1.txt, dir/file2.txt, and other\\file3.txt", 
+                 ["file1.txt", "dir\\file2.txt", "other\\file3.txt"]),
+            ]
+
+            for content, addable_files in test_cases:
+                with self.subTest(content=content, addable_files=addable_files):
+                    coder.get_addable_relative_files = MagicMock(return_value=set(addable_files))
+                    mentioned_files = coder.get_file_mentions(content)
+                    expected_files = set(addable_files)
+                    self.assertEqual(mentioned_files, expected_files, 
+                        f"Failed for content: {content}, addable_files: {addable_files}")
+
     def test_run_with_file_deletion(self):
         # Create a few temporary files