Real Alternative will allow you to play RealMedia files without having to install RealPlayer.

All RealMedia formats (.ra, .rm, .rmvb, .ram, .rpm, .rv,.rp, .rt, .smi, .smil, etc.) are supported, including streaming content and RealMedia content that is embedded in webpages.

Limitations:

* .smi and .smil files only play the first part of a clip.
* RealMedia DirectShow splitter does not work with streaming content. You must use Media Player Classic to play streaming content.