Worked on the mne-tools/mne-python repository to address a critical bug affecting directory parsing and file_id assignment in Python-based file handling pipelines. Focused on improving data integrity, the developer adjusted the loop range in the _read_dir_entry_struct function to ensure all directory entries, including those at the end, are processed and assigned correct identifiers. This targeted bug fix reduced the risk of downstream errors and enhanced the reliability of file reading operations. Additionally, the codebase was cleaned up to improve readability and maintainability, demonstrating attention to robust software practices and effective use of Python for managing complex file structures.