Liu Die Yu released source code for his WinBlox tool. WinBlox is a command line utility that can record, filter, and prevent file I/O operations. In record mode the WinBlox logs all I/O operation activity. A typical log record includes a date stamp, the operation type, the program name conducting the operation, and the target of I/O operation. In filter mode the tool can prevent file operations occurring. Yu hopes people will download the source code and help find bugs. He also cautions that the utility is still under development and that it may not be suitable for production environments.