I don't really remember why I do it this way, but I have always kept those files in the original runtime.  My extra runtimes have only the library files, character, pose, etc.  I use Poser 6, and it has never asked for a file.

I seem to remember that P5 needed the !DAZ folders in each runtime, but P6 doesn't care about that.  Someone may be able to help you further if you say which version you are using.  Sorry I could not be of more help.

John