Notes about the PPN file extension:
To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened
" (Windows 7) or "How do you want to open this file?
" (Windows 10) if you double-click the file. There click on "More apps"
and choose a suitable software to view such files on your PC or from email attachments.
The PPN file type is primarily associated with 'Lexmark' by Lexmark International, Inc.. This flash file extension is specifically made/used by Lexmark devices for updating firmware of i.e. printservers. Applying this flash file to the device is usually done by tftp or by Web interface.