Notes about the RDX file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries
, unused processes and other unfavourable system settings to identify slowdown issues.
The RDX file type is primarily associated with 'Reflex' by Borland Software Corporation. Reflex is an old DOS flat-file database system. The size of the database was limited to the amount of system memory.