having trouble understanding Sageice Grandia 2 tutorial

I have followed Sageice's instruction all the way up to the point where he wrote:

Now replace all the missing files in each directory with file CG10.SFD of the original Echelon release just rename it to the same name as the missing files

CG10. SFD in the original Echelon disk 1 or disk 2 release?
and what does it mean to "rename it to the same name as the missing files"?????

Can any experts who have succesfully done this explain this process for me?
Thanks

[The_Wraith]

There is something I didn't understand, why 3 discs ??
I compared all version released, the Echelon 1st version was corupted after 1h30 of playing, so a repack with the good video files was released from MysticWar, I rebuild the CD, it works nice. Then ClAuTo released an Autoboot version (seems using MysticWar same files)
All 2 versions were Intro ripped and replaced by Echelon Logo,
then SAGEICE released a tutorial to build the Grandia II on 3 Discs !!! Why 3
ok, SAGEICE, U didnt rip a thing, but 3 CD !!
I understand that most of video are used in battle for magical effects but the intro doesn"t give essential things to the game !
it can be ripped...
The things I didn't understand, is why more than one CD ? (execpt for having the intro ??)I am playing now for 16 hours, with the release from Clauto and everything is fine !!
I checked the video files in the 1 disk Clauto release & the 2 disc Echelon version there are quit the same, (exepct size, coze echelon reduced sound quality) but same names, sames quantities of files....
so
Plize tell me why 3 disks ?
indulge me.