bug fix: only extend path on window sys (#3265)

Author: vealocia

src/huggingface_hub/_local_folder.py

@@ -90,7 +90,7 @@ def incomplete_path(self, etag: str) -> Path:
         resolved_path = str(path.resolve())
         # Some Windows versions do not allow for paths longer than 255 characters.
         # In this case, we must specify it as an extended path by using the "\\?\" prefix.
-        if len(resolved_path) > 255 and not resolved_path.startswith("\\\\?\\"):
+        if os.name == "nt" and len(resolved_path) > 255 and not resolved_path.startswith("\\\\?\\"):
             path = Path("\\\\?\\" + resolved_path)
         return path