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It seems to be connected with how the file is saved. Images exist as separate files called pRnd*** initially. But if the file is explicitly saved as a Book Designer file, the image and the text are bundled together and necessarily saved as a binary file. At that point the prnd's become bdim's and if you reopen the file later, although the text and the image are separated again in the 'Lastfile' directory, images continue to be referred to as bdim's ...
At least, I think that's how it seems to work ...
bob
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