Filter drivers in Windows allow developers to extend, monitor, or restrict the behavior of existing drivers or file systems without modifying the original code. These drivers are crucial in fields like security (antivirus, DLP), backup, data auditing, and virtualization.
Windows support two primary types of filter drivers:
- Device Filter Drivers – filters hardware-level or device class-level interactions
- File System Filter Drivers (Minifilters) – filters file-level I/O using the Filter Manager
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