The RAM file format is a Real Audio Metadata file which is used by RealMedia from RealNetworks Inc.. Metafiles are text files which contain the URL location of a RealAudio file. Browsing directly to the RA file would mean that the browser would download it. By using the RAM file you can bypass this.
Mime type: audio/x-pn-realaudio, audio/vnd.rn-realaudio, audio/x-pm-realaudio-plugin, audio/x-pn-realvideo, audio/x-realaudio, video/x-pn-realvideo, text/plain