An xtx file extension is related to the xText and used for its source files.
XTX file extension - xText source data
What is xtx file? How to open xtx files?
File type specification:
The xtx file extension was used by old hypertext presentation program called xText, developed by Flambeaux Software.
The xtx file stores source data.
The xText seems to be obsolete product without support from developer.
This xtx 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.