Can Windows 7 read Mac disc drive as "D:"?

I'm running Windows 7 on Parallels 7, and I have to make use of a program that will read my CDVD drive for information. Unfortunately, the program can only read through the D: drive, but discs on the Macbook I'm running it on make use of the Y: drive. Is there some way I can either reconfigure or "fool" Windows 7 into reading the Y: drive as the D: drive, or am I simply doomed?