I personally am of the opinion that both make sense and should exist. Extensions are for a first pass filtering/displaying, while magic bytes should be the sour

I personally am of the opinion that both make sense and should exist. Extensions are for a first pass filtering/displaying, while magic bytes should be the source of truth, which is extra important when parsing a file anyway. Linux's binfmt_misc[0] even supports matching on either. [0]: https://en.wikipedia.org/wiki/Binfmt_misc https://en.wikipedia.org/wiki/Binfmt_misc