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.RM is an abbreviation of Real Media. RM files may contain audio and video. Apart from that, audio is also streamed in RM format.
Open .RM files

RM files can be opened in its official Real Player to be played. However, Real Player is slow and bloated, and may slow down your computer. A better option would be to use the free and open-source VLC player, which can also open Real Media (.RM) files. VLC player can also open most formats other than .RM.
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Related reading
- How to open .AMR Files
- How to open UIF files (Windows & Mac OS X)
- How to open/play .MKV files
- How to open view .NFO files
I don’t think VLC handles Real Media formats well. It’s stated in their features page as well :
http://www.videolan.org/vlc/features.html
Media Player Classic can play Real files though.