And here is another which will do similar things http://nch.com.au/scribe/index.html It is designed for transcription, but says it will play 'most' relevant audio file types (including Real Audio!!)...I will be testing it, as my wife does a lot of transcribing.

"Express Scribe is professional audio player software designed to assist the transcription of audio recordings. It is installed on the typist's computer and controlled using the keyboard (with 'hot' keys) and / or can be used with a transcription pedal. This computer transcriber application features variable speed wave playback, foot pedal operation, file management and more. This program is free."