Librettos are great little machines. Using Linux in dual boot is a much safer option than trying to have good win98 or DOS drivers.
Damn small linux in text mode will do the job. I suppose it can also run in X windows if you have 32Mb of ram (my libretto is a 64mb ct100).
My transfer method was to use linux and a pcmcia/usb card (libretto has an internal usb... but no plug... only on the largest dock (libretto also have an internal midi port but no way to use it...)).