I'm using core ftp LE, and I've this problem... probably I'm the problem

So, I made a Win2k Pro FTP server using Serv-U and a no-ip.com address, and my server is reachable using ping command but... from Serv-U administration, I've shared all my disks that reside onto the server to access them remotely. So I've C:\ disk, D:\ disk, E:\ disk, ecc. shared and the root dir is C:\, but how can I change that disk in CoreFtp to access d:\, E:\, ecc disks? CoreFtp can't (it seems can't) reach dir different from c:\... is it possible? I've to set anything different in SERV-U?
Thank you very much
Marco