DirectInput API in WindowsXp

C# , DirectInput API, Human Interface Devices programming, Joystick Drivers, WindowsXp I need a small shim application that would interface to the DirectInput API in Windows, and would fake the presence of a joystick. I have digital input coming from a USB port connected to a USB Data Acquisition Device. This data is in the form of counts from an encoder. I want WinXp to recognise these 4 inputs (encoders 1 thru 4) as one joystick with 4 axes.