Every answer to this question online is a list of things to try. The file itself knows the answer: a .pptx is a package of parts, and printing them by size shows exactly where the hundred megabytes went.
This prints that list: pictures, video and audio, embedded fonts, unreferenced masters and layouts, slides and properties — plus the biggest single parts by name, and which of our tools acts on each category.
See what is actually taking up space in a .pptx, part by part, and what to do about it.
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