The libusb-win32-devel-filter-1.2.6.0.exe is a specialized utility used to install a "filter driver" for USB devices on Windows systems. This is commonly required for low-level device communication, such as unbricking MediaTek (MTK) smartphones or interfacing with custom USB hardware like the USBasp. Download Guide
If you prefer a portable installation or are including libusb in your project repository: download libusb-win64-devel-filter-1.2.6.0
Since version 1.2.6.0 is quite old (released approx. 2012), it is considered legacy software. The libusb-win32-devel-filter-1
Ensure you download this from a reputable source like the official libusb-win32 SourceForge libusb Windows 64-bit development files libusb filter driver