A vtn file extension is related to the VTWIN software and used for its network project files.
VTN file extension - VTWIN network project
What is vtn file? How to open vtn files?
File type specification:
The vtn file extension is associated with the VTWIN, a software developed by ESA Electronica company. The vtn file stores network project.
The VTWIN seems to be obsolete product without support from developer or producer.
This vtn 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.