depends on what your trying to do, if you want a small dummy file )1kb) to replace certain set of files (e.g. data_f.afs, data_s.afs, etc) ,then you can just use notepad and dos to do that, quite simple really, ill talk to you on MSN, about it if ya want.
(for a certain example, replace data_e.afs, or any others like dummy bin,in the lines or with whatever file you want to replace)
open notepad, paste this in:
copy DUMMY DATA_F.AFS
copy DUMMY DATA_G.AFS
copy DUMMY DATA_I.AFS
copy DUMMY DATA_J.AFS
copy DUMMY DATA_S.AFS
copy DUMMY DUMMY.BIN
save as anything you want, e.g. dummy.txt.
rename to a .bat extension dummy.txt > dummy.bat
create a file called DUMMY, by opening notpepad, save as blank, and remove the file extension.
and run the first BAT file and it should replace the files.
There might be a program out to do this, but i always have problems with one of them.
Might of made it sound a bit difficult, but hopefully someone else can help.