I'd also note that any prc files, or mobis made with older versions of KG, will not produce the "MasterMobi" file needed to make use of the Fire's abilities. When you drop a prc file on KDP, it will stay a prc file, in essence (yes, it will crunch into azw, but it won't be a MasterMobi).
What it does mean is that your books shan't be Fire-optimized, which also means that you might get unexpected results when the books are loaded onto the Fire. We gen our books from ePUBs, but we test every single book, practically page-by-page, because we've had some highly unexpected results from ePUBs run through the Fire, and we've also had unexpected results from "regular" mobi's/prc's that were made pre-K8.
Lastly, FWIW, aside from the Previewer GUI interface, I'd also note that instead of screwing around with the CL, you can simply take an OPF, or ePUB, or html file, etc., and literally DRAG AND DROP it on the KindleGen.exe program icon in the directory in which it is installed, and it works perfectly. ;-)
HTH,
Hitch
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