Files with xmpp file extension can be found as data packages for Extensible Messaging and Presence Protocol.
XMPP file extension - Extensible Messaging and Presence Protocol
What is xmpp file? How to open xmpp files?
File type specification:
The xmpp file extension is mainly related to Extensible Messaging and Presence Protocol and used for its default package format.
XMPP is a communications protocol for message-oriented middleware based on XML, formerly known as Jabber.
This xmpp 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.