What's in a PowerPoint file?
https://editide.com/blog/what-is-a-pptx-file/
I wrote an article explaining the basics of the .pptx file format. I tried to build up the concepts so hopefully it doesn't read like a boring technical dump.
Should be interesting for anyone getting started with PowerPoint automation, particularly the Open XML SDK in C# or python-pptx.
But hopefully it's interesting to anyone who's curious about how things work under the hood!
For a much deeper and thorough explanation, I recommend checking out OOXML Hacking: Unlocking Microsoft Office's Secrets by John Korchok
Disclosure: I am the founder of editide and published this on our website. The article doesn't talk about the product, I wrote it to help me make sense of what I've learned wrestling with pptx files.