Real Media format is created by RealNetwork for steaming online content. And Real Media file (.ra, .rmvb, .rm, .ram, .rpm) can only be played in Real One player also known as RealPlayer. If you have real media files which is corrupted and looking for way to repair & fix it then here is extremely useful freeware utility, Real Media File Inspector.
Real Media File Inspector is small tool that will allow you to check and fix errors, rebuild index chunks, cut real media files. It also fixes common errors encountered while playing .rm & .rmvb files such as some portion of file cannot be played or player cannot seek in the file.