RealNetwork�s RealPlayer media player
RM is a file extension for a container file used by RealNetwork’s RealPlayer media player software for audio and video files, or links to these files for live streaming. RM stands for RealMedia. RealMedia files usually use RealNetwork’s own proprietary Realvideo and RealAudio codecs.
MIME type: application/vnd.rn-realmedia, audio/vnd.rn-realaudio, audio/x-pn-realaudio, Maudio/x-realaudio, audio/x-pm-realaudio-plugin
Learn more about RM files:
Visit the RealPlayer webpage.
Search for answers to RM-related questions at IT Knowledge Exchange.