You do this wrong. In Devs/kickstarts directory you need at least these files. And most of WHDLoad games which new kickstart files should work.
On net you should be able to find these files in correct version and *.rtb files can be downloaded from Aminet. See example information on readme of some game which need any kickstart Image. For example this one: http://whdload.de/games/Franko.html