What is RAM file?

The Ram file is the basic means for launching a clip or a simple sequence of clips that plays in RealOne Player. You can also use the Ram file to open an HTML page in the media browser or related info pane.

RealMedia Metadata
File extension: .ram
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
Developed by: RealNetworks
Type of format: ramfile, RealMedia File, RealPlayer.RAM.6, UltraPlayer.AudioFile, Winamp.File

What is MP3 File?

MPEG-1 Audio Layer 3
File extension: .mp3
MIME type: audio/mpeg
Type of format: Audio

Convert RAM to MP3 with 

RM to MP3 Converter or Mini-stream Ripper