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 .rnx .smi .smil etc.) are supported, including streaming content and RealMedia content that is embedded in webpages.
* Updated Media Player Classic to version 220.127.116.11 rev. 50
* Updated RealMedia components to version 18.104.22.1686
Product page: here