Sorry but if your work-station is standalone I don't think that you can transfer data, less than you do not have "DAT" or "CD-ROM RW", from the two machine. I think that best solution is to connect your sun work-station to local-area-network so you can transfer files with every ftp programs. A good alternative is to have a linux machine with samba installed, in this case you can mount the sun hard-disk on your linux server and then read and write this disk under windows. An others positive note of this late solution is that you can (with a simple X-windows client e.g. X-WIN) run programs on solaris OS in remote mode under windows.
Regards Gnomix
It has been a while, but as I recall - Solaris can read and write DOS compatilble floppy disks. Break you file into 1.4m pieces and put it on floppy disks that you can read into your PC.