A richmedia file extension is related to the Norton apps. A richmedia file stores data.
RICHMEDIA file extension - Norton Guides data
What is richmedia file? How to open richmedia files?
File type specification:
The richmedia file extension is associated with some Norton applications (Norton Guide) developed by the Symantec.
Most likely some old format without support from developer. No further information could be found.
This richmedia file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.