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 web pages.
Some advantages compared to RealPlayer:
Quick and easy install
It’s easy to make an unattended installation
Proper uninstallation
No background processes
Use a player of your own choice
Low on resources
No advertising, no registration forms, nothing annoying
Limitations:
.smi and .smil files only play the first part of a clip. This is only a problem when the clip consists of multiple parts. These files are not very common. These files do play correctly when embedded in a browser.
The RealMedia DirectShow splitter does not work with streaming content. You must use the included Media Player Classic to play streaming content.