This is a good thing. It basically contains an entire website, with HTML and assets inside a single ZIP, and a little bit of metadata.
It is incomprehensible why browsers don't just implement it as they already have all the web part, and also ZIP stuff:
The situation is so sad. Ubuntu 21.04 doesn't come with a reader installed by default:
Extract certain pages of a PDF:
pdftk input.pdf cat 2-4 output out1.pdf Articles by others on the same topic
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