An rdx file extension is associated with the Borland Reflex and used for its database files.
RDX file extension - Borland Reflex database
What is rdx file? How to open rdx files?
File type specification:
The rdx file extension is related to Borland Reflex, a flat-file database management system for DOS. It was the first commercial PC database to use the mouse and graphics mode, and drag-and-drop capability in the report formatting module.
The rdx file contains database.
This rdx 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.