You can use K-Lite Code Pack for this and many similar formats. Please see:
http://en.wikipedia.org/wiki/K-Lite_Codec_Pack[
^],
http://codecguide.com/[
^].
Another way is using ffmpeg to transcode your media files into something you can work with. Please see:
http://en.wikipedia.org/wiki/FFmpeg[
^] (please see the list of the supported format here, some Real formats you may need are supported),
http://ffmpeg.org/[
^].
I'm using the version of May 13, 2012 right now and your format is Real media (RealAudio or RealVideo); the codec list for this versions shows:
Codecs:
D..... = Decoding supported
.E.... = Encoding supported
..V... = Video codec
..A... = Audio codec
..S... = Subtitle codec
...S.. = Supports draw_horiz_band
....D. = Supports direct rendering method 1
.....T = Supports weird frame truncation
D A D ralf RealAudio Lossless
DEA D real_144 RealAudio 1.0 (14.4K)
D A D real_288 RealAudio 2.0 (28.8K)
DEV D rv10 RealVideo 1.0
DEV D rv20 RealVideo 2.0
D V D rv30 RealVideo 3.0
D V D rv40 RealVideo 4.0
D A D sipr RealAudio SIPR / ACELP.NET
Of course, both tools are free to use.
Good luck,
—SA