I did some research into this and looked over the last few full installs I had for Dimension Pro.
In fact, in the Sonar X1 Producer full install, the DP Multisample files are still the same as this new install.
In particular, every sample file is in FLAC format and 'grepping' through all the SFZ files, there are no '.wav' file references.
So, in short, my own installation was in error in some way on the two files I mentioned above with the WAV sample references.
I have no idea how I got into that state as I don't think I edited any installed SFZ files, but for what it worth, the final judgement still goes:
The Dimension Pro installer at about 3GB is one of the largest installation files I have. There is no need to update the installation if you are happy with what you have as long as you have a 'recent' install (say Sonar X1 or later).
I really hate seeing non-green lights in CCC, so I performed the lengthy update again (1.5.5.
16), but I'm rather obsessive.