Files with the .rss extension are most commonly associated with rich site summary files. These files are XML files that are used by a variety of websites to distribute information via RSS feed. The RSS files often contain news headlines and other Web content in a text-only format that opens the RSS feed in Web browsers that support the format.
The .rss file extension is also used for PlanMan image files, ReliaSoft BlockSim files, Symbian OS application resource files and Rockwell Logix 500 SLC-5 software files.
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If you have additional information about the RSS file format or software that uses files with the RSS suffix, please do get in touch - we would love hearing from you.