Files with xia file extension can be found as encrypted files from Chiasmus program from Bundesamt für Sicherheit in der Informationstechnik.
XIA file extension - Chiasmus encrypted data
What is xia file? How to open xia files?
File type specification:
The xia file extension is used for an encryption file type from Chiasmus, some sort of specialized software by Bundesamt für Sicherheit in der Informationstechnik.
Seems to be obsolete file format without support from developer.
This xia 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.