ZMN filename extension is associated with file used by ZoneAlarm, a firewall application developed by Zone Lab.

ZMN files store email attachments designated by ZoneAlarm as potentially harmful. ZoneAlarm changes extensions of such files or programs to ZMN and stores them in special quarantine folder to prevent any damage that they can cause to user’s system should they be executed. ZoneAlarm is distributed and developed by CheckPoint Software Technologies LTD.