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Engineering

Notes from the part of the product that turns a slide document into a file PowerPoint will open without complaint. Mostly about OOXML, and mostly about the difference between a slide and a picture of a slide.

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An iceberg with a small visible peak and a large mass below the waterline, annotated with labelled cards

Engineering

What's actually inside a .pptx file, and why most AI exports are pictures

A PowerPoint file is a zip of XML documents. Once you know what's in there, the difference between a real export and a screenshot becomes obvious in about thirty seconds.

July 28, 2026 · 2 min read

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