Files with qtn file extension might be found as part of Normal security software. Virus control file.
QTN file extension - Norman virus control
What is qtn file? How to open qtn files?
File type specification:
The qtn file extension is mainly related to one of the Norman security software solution.
These qtn file contains some virus scanner related data. Might have been used in one of the previous versions of Norman software.
This qtn 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.