too lazy to log in.
in general, you cannot modify files and then slipstream them, but it depends on the file.
if you\'re talking about .INF files, however, this *can* be done, and after installation, SIGVERIF.EXE reports the files as having been digitally signed(!)
i used this in order to remove internet explorer, but you can simply check out the process in order to see what i\'m referring to.
the page below details how to modify files and slipstream them
http://home.earthlink.net/~vorck/