Compaq AIT 50 Tape Drive Direct Access (Drive Letter)

I have just added a Compaq AIT-50 SCSI Tape Drive to my
XP Pro system. XP's backup software backups data to the
tape drive correctly. I have also updated the driver.
But, I would like to assign a drive letter to the tape
drive so I may access the tape drive directly through
explorer. How do I do this? Or is there software package
that would do this for me? My main need is to move & copy
files individually from local hard drives to the tape
drive and keep the same file name extension.

Thanks.