I think you'll need to extract the game files, put the missing file in there and repack it since this game doesn't have loose images files after it's extracted normally (as in extracting the zip file downloaded). Obviously you need software for it but I can't really recall the name of it, if you feel daring, Google "RPGMaker extractor" or "Decrypter", you'll probably find it quite easily xD
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Remember I did it before for whatever reason and just left the file in there.
EDIT: Also you might wanna tag the Doc directly, it will probably be easier for him to spot your comment if the thread becomes more active xD