Well with SilentWisdoms tool grimoire you could repack it in the data files, not sure about his rmod tool
So if you have not used that tool then you need to perform what is called client resourcing.
You will need to hash the file name depending on how you launch the client (ascii).rdb if you launch with ascii in your .bat file or plain .rdb if you launch code page like windows-1252 in your .bat file.
Then place the rdb with the hashed file name in the clients resource folder.
As far as hashing file names there should be a rappelz file hasher around somewhere you can check in the collection thread...
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Or some of the RDB tools can actually help you out with that also.
You should really check out that collection thread. A lot of the answers we have given here to your questions can be found easily in guides and tools threads that are linked from there.
There is a whole plethora of good information.