To unzip a .7z file, find it in your iPhone’s downloads folder and then long-press it to open the options. From here, choose ‘Share,’ then, from the list of app icons, select ‘Unzip.’ If you don’t see ...

Safari has an annoying habit of appending ".txt" to downloaded files that already have perfectly good extensions. OTOH, many <I>sites</I> will mis-identify media files, which is just as annoying.