Damien
on the Epson R2400 running under XP the files are as follows -
C:\Program Files\EPSON\Epson Stylus Photo R2400
there are two files -
E_FCF19SE.UCF and E_FCF29SE.UCF
One is for PK settings, the other for MK. I assume UCF stands for User Configuration File.
It may be a similar setup for your 4800.
John