A dxn file extension is related to the dexNET and used for its fax documents.
DXN file extension - Fujitsu dexNET fax document
What is dxn file? How to open dxn files?
File type specification:
The dxn file extension is associated with the dexNET, probably some kind of software used to send a receive fax documents, developed by Fujitsu.
The dxn file contains fax document. Seems to be obsolete.
This dxn 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.