> What interaction does happen occurs over interfaces that are very heavily policed by the OS (think: is generally doesn't happen without the user giving some p

> What interaction does happen occurs over interfaces that are very heavily policed by the OS (think: is generally doesn't happen without the user giving some permission). The result has been a revolution: almost no one bothers with anti virus software on the phone OS's any more, and any malware you do install can be uninstalled with the click of a button. Taken to its extremes (which Google has been moving Android towards), unfortunately it also breaks a number of existing workflows. If you follow the documentation, any multi-file formats (HTML documents with their assorted resources – JS/CSS/images/links to other HTML files/..., playlists, videos with externally stored subtitles, multi-part archives, ...) are broken on recent Android versions if you need to handle them in an external app, e.g. if you're writing a file explorer which then naturally needs to call out to other installed apps for actually opening those files.