More about RSMF Viewer
RSMF is Relativity’s new file format aka “Relativity Short Message File”.
RSMF Viewer has premium (paid) features that allow saving data to either new RSMF or industry standard DAT file for compatibility with other applications.
Relativity Short Message Format
Relativity now supports a new file type, Relativity Short Message Format (.rsmf). This file allows you to view short message format files in the Short Message Viewer including SMS, Slack, Skype, iMessage, and Bloomberg.