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