Note that it only works with new-style pptx files.
For the old format, GOOD LUCK. They are poorly-documented and tricky to
work with. Tools like Docsplit
might do what you want for these, but they depend on LibreOffice - and
correspondingly, can only read PPT files that work in LibreOffice.
One gotcha: none of these will replicate any of the more complex
(animations, transitions). ruby_powerpoint doesn’t even give text style
info back, just text and images.
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