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New File Format
(lemmy.ml)
Post funny things about programming here! (Or just rant about your favourite programming language.)
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.