Note: After a long time trying to get direct delivery of PS, PDF and MIDI files to Windows and Mac browsers, I've given up. It apparently can't be done reliably, so that the right helper program opens automatically. Or maybe nobody can explain how to do it right. So now you get the above list of files, which should be delivered with a MIME type that your browser can understand and deal with correctly.

The TXT, GIF and PNG formats can be displayed by all browsers, so they are delivered directly.