create DLL

I have a software wich work on win95 OS. I replace the OS to XP, and the sofware dosent work. After cheking and analizing, i found that INP and OUTP function does not work with XP OS. I found a dll wich support the function in XP ([login to view URL]) on the net. Unfortunately this driver Support only visual C 6 or higher. My program was written on Visual C 1.5, therefore the complier does not support it. I need a DLL for those function (INP ,OUTP ) compatible to work with visual C 1.52