Notes about the PPN file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
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.