At present, most of them use 32-bit drivers, and the drivers of 32-bit systems are all 32-bit, and the extension is usually. sys，。 DLL and so on. 64-bit systems use 64-bit drivers.

Yes. CAT file is a digital signature file provided by Microsoft for the driver. Microsoft tests the compatibility and stability of drivers developed by hardware manufacturers (this kind of certification is strict), and the drivers that can pass the test are granted digital signatures (a. cat file) and issued with the Designed for Windows logo.

To sum up, the driver with digital signature has passed the compatibility and stability test of Microsoft, and its use is guaranteed. Ordinary drivers have not been strictly tested and may not be very useful in compatibility and stability.

64-bit systems must be equipped with digital signature drivers, and 32-bit systems can be equipped with digital signature drivers and ordinary drivers.