A sits above or below a device’s function driver. In the libusb context, the filter driver intercepts USB I/O requests, allowing user-space applications (like your custom software) to send and receive raw USB transfers without the OS’s default driver interfering.
This specific file is the installer for the filter driver. It is commonly used on Windows to allow programs to communicate directly with USB devices (like Arduino, 3D printers, or development boards) without needing the manufacturer's proprietary drivers. libusbwin64develfilter1260exe new