Wztong developed an On-Demand File Scanning Optimization for the sandboxie-plus/Sandboxie repository, focusing on improving directory scan performance for OneDrive environments. By leveraging C++ and system programming skills, Wztong implemented targeted filtering to identify OneDrive On-Demand files and prevent unnecessary recall of cloud-backed offline files during scans. The solution utilized precise file system operations, including checks for FILE_ATTRIBUTE_RECALL_ON_DATA_ACCESS, to reduce I/O overhead and enhance scan accuracy in hybrid cloud scenarios. The work included clear code documentation and maintainability improvements, laying a solid foundation for future enhancements while addressing a nuanced challenge in cloud-aware file system integration.