An rxh file extension is related to the Borland Reflex and used for its database help files.
RXH file extension - Reflex database help data
What is rxh file? How to open rxh files?
File type specification:
The rxh file extension is associated with Borland Reflex, and old database system for MS-DOS operating system. The rxh files contain help data.
The Reflex seems to be obsolete software without support from developer, or distributor.
This rxh 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.