Currently the naming of file types is quite inconsistent: PDF, pdf, Zip, ZIP, AUX, aux, etc...

I'm not sure if I have a strong opinion here, but it would be nice to have it consistent.

Also, one one occasion it says .bib file, i.e. a dot before the file ending. Some of them have a dash, like Zip-archive.

Any opinions on the correct way of doing it? Lower case, except when starting a sentence, without a leading dot and no trailing dash?