i know you do not need the encryption, but sftp is easyest to get working, sounds odd but is true.
just klick penguin icon then services then you klick start ssh server
now you just give a password to knoppix.
you then go to other computer and start konqueror type fish://knoppix@ipnumber then you wil be asked for a password, as simple as that in 95% of cases.
EDIT
you may want to use konqueror as filemanager and use a extra tab to copy paste to
/EDIT