No. But the Windows office suite is
You can rename a docx and extract it.
Don't know how it is with ppt/x and xls/x
xls & co. (the older ones) are something custom. Only after standardization as OOXML (a shitshow btw, there's a lengthy wiki article about it) they got zip.
The whole Word and Libre/OO-Writer world is a shit show.
So complex and everyone decides to interpret it a bit differently.
Not even Libre and OO can be interoperabel between the same file and feature.
No. The Office ???x files are archives. Inside them you can find folders with resources. Among those, you can find files written in markup languages.
Not quite the same thing.
Just rename your .docx file as .zip to check its contents.
Ah, last time I checked it was a kind of ML directly (XML, I'm guessing from cymor@midwest.social their comment), but that's back in Office 2016's time, so things might have changed.
Thanks for the heads-up!
Just because you can open it with 7-zip doesn't mean it's a zip file. Some exes are also zip files.
