I knew a powerpoint is basically a zip file when I was trying to crack a pptx file last year, the AI basically said “pptx file is basically a zip file, let’s do …”, when I unzipped it, turned out the password protection is useless, all assets and everything are in there unprotected, including the 3D models inside. And you can pack it to a file again, just like the protected one but with no password.