Is this the original one with 4 buttons? I had both the original and Pro (which looked more like a PSX controller with no analog sticks).
The original one doesn't need any drivers because the D-pad uses analog axes (but just simulates slamming an analog stick to the extreme ends of the 8 directions) and the buttons from both joystick inputs (PC joystick ports support two joysticks, each with a horizontal & vertical analog axis and 2 buttons, for a total of 4 axes and 4 buttons).
The Pro actually used special encoding (like the expensive CH/FCS flight sticks) to encode data for a D-pad and 10 buttons over a standard joystick port. I think DOS games needed to have special support for it, while Windows could use a driver to translate, and it also may have had a compatibility mode switch to run in analog axes + 4 button mode (like the original Gravis Gamepad) for older DOS games.