This question has come up many times before, you need to look in the appropriate forum http://www.cnczone.com/forums/forumdisplay.php?f=70
You can use wordpad etc, as long as the file is in TXT or ascii format, I would use a three wire cable from the serial adaptor to the Fanuc.
You need however a modem or communication program, there are several available, Dan Fritz has one or you can go to the Cadem site and check all the parameters you need to set.
Al.