Dumping binary files

Hello, I read that we can dumped file into the system (http://www.suse.de/~nashif/autoinstall/9.1/html/createprofile.completeconf.h...) during installation. I want to dump a binary file (.tar.gz). Should I create my own RPM ? encode the file in BASE64 in a cdata section and use a script to decode it ? or is there an easier way ? Thanks, Pierre